1. A mathematical aid in optimizing engineering designs;Zener,1961
2. A further aid in optimizing engineering designs;Zener,1962
3. Dual programs and minimum cost;Duffin;J. Soc. Ind. Appl. Math.,1962
4. Optimizing engineering design under inequality constraints;Charnes,1962
5. Cost minimization problems treated by geometric means;Duffin;Oper. Res.,1962