The development of sufficient conditions in the calculus of variations ...
by William Larkin Duren, jr.
APA Citation
Duren, W. Larkin. (1930). The development of sufficient conditions in the calculus of variations ... [Chicago].
MLA Citation
Duren, William Larkin, 1905-. The Development of Sufficient Conditions In the Calculus of Variations ... [Chicago], 1930.
Warning: These citations may not always be complete (especially for serials).