Goursat, E. (1964). Variation of solutions: Partial differential equations of the second order.
Chicago Edition CitationGoursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. Dover Publcations, New York, 1964.
MLA Edition CitationGoursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. 1964.
Warning: These citations may not always be 100% accurate.