"Prior Reduced Fill-In in Solving Equations in Interior-Point Algorithms."

Birge, John R., Robert M. Freund, and Robert Vanderbei. Operations Research Letters Vol. 11, No. 4 (1992): 195-198.

"Implementation and Empirical Study of a Combined Phase I - Phase II Potential Reduction Algorithm for Linear Programming."

Freund, Robert M., and Hitendra Wadhwa, Working Paper. March 1992.

"A Method for the Parametric Center Problem, with a Strictly Monotone Polynomial-Time Algorithm for Linear Programming."

Freund, Robert M., and Kok-Choon Tan. Mathematics of Operations Research Vol. 16, No. 4 (1991): 775-801.

"A Potential Function Reduction Algorithm for Solving a Linear Program Directly from an Infeasible "Warm Start"."

Freund, Robert M. Mathematical Programming Vol. 52, No. 1 (1991): 441-466.

"Polynomial-Time Algorithms for Linear Programming based only on Primal Scaling and Projected Gradients of a Potential Function."

Freund, Robert M. Mathematical Programming Vol. 51, No. 1 (1991): 203-222.

"Theoretical Efficiency of a Shifted Barrier Function Algorithm for Linear Programming."

Freund, Robert M. Linear Algebra and its Applications Vol. 152, No. 1 (1991): 19-41.