Authors:  L. S. Pontryagin, V. G. Boltyanskii, R. V. Gamkrelidze, E. F. Mishchenko 
 Title:  The mathematical theory of optimal processes 
 Publisher:  Interscience Publishers John Wiley & Sons, Inc. 
 Place:  New York–London 
 Year:  1962 
 Number of pages:  360 

