Partial differential equations and the calculus of variations : essays in honor of Ennio De Giorgi /
edited by F. Colombini ... [et al.].
- Boston : Birkhäuser, 1989.
- 2 v. (xxii, 1018 p.) : ill. ; 24 cm.
- Progress in nonlinear differential equations and their applications ; v. 1-2 .