Krasnosel'skij, M. A. and Others Positive linear systems; the methods of positive operators By M. A. Krasnosel'skij, Je. A. Lifshits and A. V. Sobolev - Berlin Springer-Verlag 1989 - vii, 354p. Index - Sigma series in Applied Mathematics no. 5 . "Tr. from the Russian by Jurgen Appell". Dewey Class. No.: 515.72 / K89.PL