implications of the co existence of different technologies for general economies and industrial firms Mathur,P N creator text New Delhi Manak publications 2009 monographic xxiii,226p 24cm (Hb) by P N Mathur includes index Prices mathematical models Technologicalj innovation economic aspects 338.52 9788178311920 ENG-97862 DBAD/PUB 20100803104839.0