Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
C. A. Buzzi, Jaume Llibre, J. C. Medrado. 4 with two zones. Mathematics and Computers in Simulation, 82(4):533-539, 2011. [doi]