Letters to the Editor
Abstract
Letters:
—On “An Extension of Lawler and Bell's Method of Discrete Optimization” by Mao and Wallingford—letter by A. De Maio and C. Roveda, Istituto di Elettronica, Politecnico di Milano, Milan, Italy
—On Information Systems—letter by L. E. Stanfel, Industrial and Systems Engineering, University of Florida, Gainesville, Florida.

