Many scholarly publications are available on online sites such as Academe, RePEc or SSRN. Some more recent publications appeared in open-access journals and are therefore available there free of charge.
Migration
PV Schaeffer, 1984. “Barriers and Foresight in International Labor Migration.” Environment and Planning A 16(4): 451-466
This is an application of the well-known Harris-Todaro Model (HTM) to "guestworker" migration, that is, migrants who would prefer to return home if economic opportunities were to improve. It also offers a generalization of the HTM which helps better understand the mathematical structure of that model. Unlike the original HTM, this is a model of repeat migration as it allows for a second move after the first. Its mathematical structure is that of an absorbing Markov Chain.
PV Schaeffer, 1985. “Human Capital Accumulation and Job Mobility.” Journal of Regional Science 25(1): 103-114
This is a theoretical model of repeat migration as a process of accumulating human capital, particularly but not exclusively, through job experience. Like the Harris-Todaro Model (HTM), it is a dynamic model using optimal control theory, but unlike the HTM, it is deterministic and not probabilistic. The model was motivated by a paper in JET by Y Weiss (1971). Probably because of the difficulty to test such models empirically (lack of data) using econometrics, there are not very many scholarly publications on the topic of repeat migration.
PV Schaeffer, 1987. “A Family Model of Migration.” Socio-Economic Planning Sciences 21(4): 263-269
This is an exploration of the idea of Family or Household Migration introduced by J Mincer (1978) in JPE. Mincer showed that migration decisions may differ when they are made by individual movers vs. adult members of a family. While Mincer focused on the cost to the individual moving as part of a family, this paper focusses on benefits of individual migrants who move with the support of and as continuing members of a family. My interest in this topic was strongly motivated not only by Mincer's excellent contribution, but by a footnote in which he notes the stress that the difference between the individual and the family optimum might cause to family cohesion.
PV Schaeffer, 1995: “The Work Effort and the Consumption of Immigrants as a Function of their Assimilation.” International Economic Review 36(3): 625-642
This is a two-period model that allows for "assimilation" of the immigrant. Of course, assimilation has several dimensions and is a contested term in the migration literature. This theoretical model predicts that the greater the distance between immigrant and host society, the greater the immigrant's work efforts. This contribution was published at roughly the same time when other economists dealt with very similar issues on a theoretical basis, particularly S Djajic and O Stark.
PV Schaeffer, MS Kahsai, 2011, “A Theoretical Note on the Relationship between Documented and Undocumented Immigration.” International Journal of Population Research. Article ID 873967, 7 pages, http://dx.doi.org/10.1155/2011/873967
We show that migration policy that focuses exclusively on legal migration is unlikely to achieve its objectives. The reason is that documented and undocumented migrations are substitutes, albeit imperfect ones. Therefore, what happens to one will also influence the other.
PV Schaeffer, JO Bukenya, 2014. “Assimilation of Foreigners in Former West Germany.” International Migration, 52(4): 157-174
In this article we examine the different incentives to acquire German citizenship for immigrants from EU countries versus those from Turkey. As expected, immigrants from Turkey were more interested in citizenship that EU citizens since the latter already possessed many of the rights usually reserved for citizens.
PV Schaeffer, 2023. “Life Course and Structural Migrations: Refining Migration Classifications.” International Regional Science Review 46(5. July): 359-380
In this article I present a classification system to distinguish between types of human migration, particularly, labor migration. It builds on earlier ideas from a number of authors.
Energy
P Schaeffer, L Cherene, 1979. Integer and Mixed Integer Linear Programming Models of Investment in the Electric Power Industry. In RH Day, editor, Decisions Methodology Relative to the Adoption of New Technology: Load Curves and the Capacity Expansion Decision. Palo Alto, CA: Electric Power Research Institute, Research Project 1298-2, pp. 4.1 – 4.82
This publication summarizes the literature of the first three decades of mathematical programming models of optimal electricity generation investment decisions. It is still useful to those starting to work in this specialized field now by providing information and background for today's modeling efforts.
PV Schaeffer, LJ Cherene, 1989. The inclusion of "spinning reserves" in investment and simulation models for electricity generation. European Journal of Operational Research
In this article we showed, for the first time to our best knowledge, that the ease and speed with which generating capacity can be added or removed as electricity demand changes with time of day, impact the recommended optimal power plant mix. This point is even more relevant in practice today because of the increased roles played by renewables, which put greater demands on the "flexibility" of other equipment when conditions (sunshine, wind) can change suddenly and unexpectedly.
MS Kahsai, C Nondo, PV Schaeffer, 2012. “Income in the Energy–GDP Nexus: Evidence from Sub-Saharan Africa.” Energy Economics 34(3): 739-746
This is an empirical study of the relationship between access to energy and economic development.
C Nondo, MS Kahsai, PV Schaeffer, 2012. “Energy Consumption and Economic Growth: Evidence from COMESA Countries.” Southwestern Economic Review 39(1): 107-112
This study is related to the preceding one. The difference is that this study looks at energy consumption. which depends on access to energy sources, and its relationship to economic growth.
Rural and Regional Economic Development
PV Schaeffer, RW Jackson, JO Bukenya, 2011, “Regional Science Reconsidered.” Review of Regional Studies 41(2/3): 161-177
This is a commentary on the nature of regional science as an interdisciplinary area of study and research.
GH Gebremeriam, TG Gebremedhin, PV Schaeffer, 2012. “County-Level Determinants of Local Public Services in Appalachia: A Multivariate Spatial Autoregressive Model Approach.” Annals of Regional Science. 49(1): 175-190
We tested for spatial interdependence and found that there are significant spillover effects among local governments with respect to spending on public services. 
PV Schaeffer, MS Kahsai, RW Jackson, 2013. “Beyond the Urban-Rural Dichotomy. Essay in Honor of Professor A.M. Isserman.” International Regional Science Review 36(1): 81-96
This article highlights several of A Isserman's research contributions related to rural economic development and evaluates them relative to the status of research and policy, respectively, around the time of the publication. By the way, the whole issue of the journal is dedicated to Professor Isserman's work. He was a creative scholar, a mentor, and a good friend, who influenced many in our profession.
J Herath, P Schaeffer, TG Gebremedhin, 2013. “Employment Change in LDs of West Virginia: A Dynamic Spatial Shift-Share Analysis,” American Journal of Rural Development, 1(1): 99-105
In this empirical study we used Local Development (LD) districts as the unit of analysis. The data used were for the period 1976 to 2007. Among other things, the results show the employment decline in mining and manufacturing, two of West Virginia's traditional industries.
PV Schaeffer, S Weiler, S Loveridge, 2014. “Urban and Rural: Opposites no More.” Introduction to special issue of Economic Development Quarterly, 28(1): 3-4 (no copy available for downloading)
This is the introduction to a special issue of EDQ dealing with rural development. We argue that today, the urban-rural difference in industrial structure is no longer is pronounced as it has been historically. In both, the service sector plays the largest role. Of course, a closer look at each sector reveals differences not visible in the aggregate data.
PV Schaeffer, 2018. “The Rules of the Game.” Fellow’s Address, Review of Regional Studies, 48(3): 271-277 
In this article I argue that the absence, or near-absence, of some groups, such as labor from the process when programs are designed, trade treaties negotiated, or laws introduced in legislature, does more long-term harm to the interests of such groups than almost anything else.
Historic Preservation, Community Planning
PV Schaeffer, LD Hopkins, 1987. “Behavior of Land Developers: Planning and the Economics of Information.” Environment and Planning A 19(9): 1221-1232
This is maybe the first theoretical effort to explore the relationship between planning and the economics of information. LD Hopkins views planning primarily as the gathering and evaluating of information to make decisions. He heavily influenced my view of planning theory.
PV Schaeffer, CA Millerick, 1991. “The Impact of Historic District Designation on Property Values: An Empirical Study.” Economic Development Quarterly 5(4): 301-312 
This is one of the first, if not the first, econometric estimation of the impact of historic district designation. The data were collected for the historic Beverly Hills and Morgan Park communities on Chicago's southwest side.
RS Mack, PV Schaeffer, 1993. “Nonmetropolitan Manufacturing in the United States and Product Cycle Theory: A Review of the Literature.” Journal of Planning Literature 8(2): 124-139 
This title is pretty self-explanatory. If you are new to this literature, this is a good entry into the product cycle theory literature.
Y Lee, T Cameron, PV Schaeffer, CG Schmidt, 1997. “Ethnic Minority Small Business: A Comparative Analysis of Restaurants in Denver.” Urban Geography 18(7): 591-621
This is a comparative analysis of restaurants operated by African Americans and by Chinese Americans. We were able to obtain good data for the Denver area and found some clear differences, for example in the level of investment. This is part of a large and still growing literature. In the case of the Chinese American restaurant owners. studies such as these also shed light on immigrant economic integration.
E Lange, P Schaeffer, 2001. “A Comment on the Market Value of A Room with a View.” Landscape and Urban Planning 55(2): 113-120
This a study of two hotels with an excellent view in Zurich, Switzerland. The hotels provided the equivalent of a controlled experiment as they offer identical room, some with the view and other without it. From this we can assess the economic value of the view for the property in terms of the difference in the estimated property value with and without the view. We used a very simple method on purpose because when scholars communicate results to elected officials who make final decisions about zoning, for example, they effectively delegate their decision to the specialist if they cannot understand how the result was obtained.