See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/243094486 Strictly Nonautonomous Cooperative System with a First Integral ARTICLE in SIAM JOURNAL ON MATHEMATICAL ANALYSIS · SEPTEMBER 1993 Impact Factor: 1.27 · DOI: 10.1137/0524076 CITATIONS 14 READS 14 3 AUTHORS, INCLUDING: Yang Kuang Arizona State University 136 PUBLICATIONS 5,312 CITATIONS SEE PROFILE Available from: Yang Kuang Retrieved on: 04 February 2016