Mulvey, J., Nyce, S., Clark, L, R., & Mitchell, S, O. (Eds.). (2004).Strategies to retain older workers in reinventing the retirement paradigm. Pension Research Council: The Wharton School, University of Pennsylvania. Retrieved 09/27/07 from http://rider.wharton.upenn.edu/~prc/PRC/WP/WP2004-13.pdf

"In this chapter we begin we begin by outlining the economic and demographic realities facing employers and spell out how these change the "retirement promise." To understand the process, we qualify the effect of several factors on older workers' retirement patterns, including early retirement incentives in DB plans, retiree medical coverage, and various work/life benefits including phased retirement and eldercare program."