A Modified Linear Program for Columnar Methods in Mathematical Programming. - George L. Nemhauser; William B. Widhelm (Oper. Res., 1971)

Technical Note - Computational Experience with Normed and Nonnormed Column-Generation Procedures in Nonlinear Programming. - Richard P. O'Neill; William B. Widhelm (Oper. Res., 1975)

Technical Note - Geometric Interpretation of Generalized Lagrangian Multiplier Search Procedures in the Payoff Space. - William B. Widhelm (Oper. Res., 1980)