Não informado. (1993). Calculus of Variations and Partial Differential Equations. Springer Verlag.
Chicago-referens (17:e uppl.)Não informado. Calculus of Variations and Partial Differential Equations. Berlin: Springer Verlag, 1993.
MLA-referens (8:e uppl.)Não informado. Calculus of Variations and Partial Differential Equations. Springer Verlag, 1993.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.