By Tian Yu   Ma Dexiang   Ge Weigao   in Journal of Difference Equations and Applications

ISSN:1023-6198|12|1|57-68

Taylor & Francis Ltd‎(2006)‎

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By Du Zengji   Ma Dexiang   Lin Xiaojie   in Differential Equations

ISSN:0012-2661|43|4|445-453

MAIK Nauka/Interperiodica‎(2007)‎

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