Robert Dautray, Jacques-Louis Lions ; with the collaboration of Michel Artola, Michel Cessenat and Hélène Lanchon ; translated from the French by Alan Craig ; translation editor, Ian N. Sneddon ; 1 : gw - 2 : us. -- Springer-Verlag, c1992-1993. -- (Mathematical analysis and numerical methods for science and technology / Robert Dautray, Jacques-Louis Lions ; v. 5, 6).