"Workforce Data Integration & Analysis" and "Unemployment Insurance & Extended Programs," Funded Research Projects, Illinois Department of Employment Security, 2010-2014.

"Changing Elasticities of Labor Demand in U.S. Manufacturing," Atlantic Economic Journal, 38(2), June 2010, 157-168.

 "Occupational Labor Demand and the Sources of Nonneutral Technical Change," with Wing Chan, Oxford Bulletin of Economics and Statistics, 68(1), 2006, 23-44.

"Skill-Biased Technical Change in U.S. Manufacturing: A General Index Approach," with Badi Baltagi, Journal of Econometrics, 126(2), 2005, 549-570.

"Organization of Markets for Science and Technology," with Rajeev Goel, Journal of Institutional and Theoretical Economics, 161(1), 2005, 1-17.

"Productivity, Technical Change and Labor Relations in Transportation Industries," in Research in Transportation Economics: Transportation Labor Issues and Regulatory Reform, edited by James Peoples and Wayne Talley, Elsevier Science, 2004, 109-136.

"Earnings, Employment and the Economics of Airline Labour Costs," in Taking Stock of Air Liberalization, edited by Marc Gaudry and Robert Mayes, Boston: Kluwer Academic Publishers, 1999, 115-132.

"On the Adoption of New Technologies," with Rajeev Goel, Applied Economics, 29(4), April 1997, 513-518.

"Information, Disinformation, and Union Success in Certification and Decertification Elections," with Victor Devinatz, Journal of Labor Research, 17(1), Winter 1996, 199-210

"The Measurement of Firm-Specific Indexes of Technical Change," with Badi Baltagi and James Griffin, Review of Economics and Statistics, 77(4), November 1995, 654-663

"Airline Deregulation: The Cost Pieces of the Puzzle," with Badi Baltagi and James Griffin, International Economic Review, 36(1), February 1995, 245-258.