Carathéodory, Constantin 1873-1950. Calculus of variations and partial differential equations of the first order/ Constantin Carathéodory. - San Francisco Cambridge, UK; London: Holden-Day, 1965-67. - xvi, 2 v.: 25 cm. - Holden-Day series in mathematical physics . Dewey Class. No.: 515.64 / C262c