Siegfried Schaible 
Generalized Concavity in Optimization and Economics 
 - New York  Academic Press  1981 
 - 767p 
Siegfried Schaible & William.T Ziemba: Generalized Concavity in Optimization and Economics.  New York.  Academic Press, 1981. 0-12-621120-5--(519.4SCH)   
ENGLISH 
0-12-621120-5 
519.4  / SCH