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Qualitative Theory of Dynamical Systems > 2012 > 11 > 2 > 417-433
Computers and Mathematics with Applications > 2009 > 58 > 10 > 2069-2080
Qualitative Theory of Dynamical Systems > 2012 > 11 > 2 > 417-433
Computers and Mathematics with Applications > 2009 > 58 > 10 > 2069-2080