A pension double header : reforming hybrid and multi-employer pension plans : hearing before the Subcommittee on Retirement Security and Aging of the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Ninth Congress, first session, on examining reforming hybrid and multi-employer pension plans, focusing on the causes of uncertainty for hybrids and multi-employer plans, including funding problems and proposals to restore stability and solvency, June 7, 2005.