United States. Government Accountability Office. Pension Benefit Guaranty Corporation: Workers and Retirees Experience Delays and Uncertainty when Underfunded Plans Are Terminated, text, October 29, 2009; (https://digital.library.unt.edu/ark:/67531/metadc293143/m1/1/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .