Freund, Robert M. Mathematical Programming Vol. 106, No. 3 (2006): 527-545. Working Paper.
Freund, Robert M., and Fernando Ordóñez. Mathematics of Operations Research Vol. 30, No. 1 (2005): 173-194. Working Paper.
Sun, Peng, and Robert M. Freund. Operations Research Vol. 52, No. 5 (2004): 690-706. Working Paper.
Ordóñez, Fernando, and Robert M. Freund. SIAM Journal on Optimization Vol. 14, No. 2 (2004): 307-333. Working Paper.
Bertsimas, Dimitris and Robert Freund. Belmont, MA: Dynamic Ideas, LLC, 2004.
Freund, Robert M. Mathematical Programming Vol. 99, No. 2 (2004): 197-221. Working Paper.