Differential equations / edited by M. Farkas ; [technical editor A. Sz�p]. Farkas, Mikl�s. Bolyai J�nos Matematikai T�rsulat. Differential equations Congresses. Functional differential equations Congresses. QA371 .D443 517.38 FAD Papers presented at a colloquium organized by Bolyai J�nos Mathematical Society at Keszthely, Hungary in 1974. Includes bibliographical references. Amsterdam ; New York : North-Holland, 1977. 1977. 1977 Text 418 p. : eng Colloquia mathematica Societatis J�nos Bolyai ; 15 Colloquia mathematica Societatis J�nos Bolyai ; 15.