Lions J L Perturbations singulieres dans les problemes aux limites et en controle optimal Lions J L - Berlin Springer-Verlag 1973 - xii, 645p. cm. - Lecture notes in mathematics; 323 . Standard No.: 25148 Source: Textual Subjects--Topical Terms: Astrophysics Dewey Class. No.: B9:74, 122L3