Birge, John R., Robert M. Freund, and Robert Vanderbei. Operations Research Letters Vol. 11, No. 4 (1992): 195-198.
Freund, Robert M., and Hitendra Wadhwa, Working Paper. March 1992.
Freund, Robert M., and Kok-Choon Tan. Mathematics of Operations Research Vol. 16, No. 4 (1991): 775-801.
Freund, Robert M. Mathematical Programming Vol. 52, No. 1 (1991): 441-466.
Freund, Robert M. Mathematical Programming Vol. 51, No. 1 (1991): 203-222.
Freund, Robert M. Linear Algebra and its Applications Vol. 152, No. 1 (1991): 19-41.