Blum, Edward Kenneth (December 1963). "Reviewed Work: The Mathematical Theory of Optimal Processes by Pontryagin, Boltyanskii, Gamkrelidze, Mishchenko". The American Mathematical Monthly. 70 (10): 1114–1116. doi:10.2307/2312867. JSTOR2312867.
Blum, Edward Kenneth (December 1963). "Reviewed Work: The Mathematical Theory of Optimal Processes by Pontryagin, Boltyanskii, Gamkrelidze, Mishchenko". The American Mathematical Monthly. 70 (10): 1114–1116. doi:10.2307/2312867. JSTOR2312867.