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ON POSITIVE PERIODIC SOLUTIONS OF GENERALIZED LOTKA-VOLTERRA COMPETING SPECIES SYSTEMS WITH FORCED TERMS

Li\ Lin (Beijing Institute of Petro Chemical Technology,Beijing 102600)  
In the present paper,we consider the Lotka Volterra type n species competing systems with periodic coeffcients and periodic forced terms.We prove that if the forced terms are negative, the system has at least two positive (componentwise)periodic solutions.
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