1. Letter to the Editor—Comments on a Paper by Bowman
2. Laplace Transforms for the Economic Analysis of Deterministic Problems in Engineering
3. Canada , John R.Intermediate Economic Analysis for Management and Engineering, Prentice-Hall , p. 28 ( 1971 ).
4. Grant , E. L. and Ireson , W. G.Principles of Engineering Economy, The Ronald Press Company , New York , Fourth Edition , p. 495 ( 1964 ).