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 of economic opportunities improve. It also offers a generalization of the HTM which helps better understand the mathematical structure of the model.
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
An empirical study of the relationship between access to energy and economic development.
Rural Economic Development
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.
Historic Preservation, Community Development
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.