Goursat, E. (1964). Variation of solutions: Partial differential equations of the second order.
استشهاد بنمط شيكاغوGoursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. Dover Publcations, New York, 1964.
MLA استشهادGoursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. 1964.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.