Partial differential equations;
an introduction.
APA Citation
Hellwig, G. (1964). Partial differential equations: an introduction. [1st English translated ed.]. New York: Blaisdell Pub. Co.
MLA Citation
Hellwig, Günter, 1926-. Partial Differential Equations: an Introduction. [1st English translated ed.]. New York: Blaisdell Pub. Co, 1964.
Warning: These citations may not always be complete (especially for serials).