Periodic solutions of periodically forced weakly coupled non-degenerate systemsFootnote^∗

^∗This work was sponsored in part by the National science Fooundation under grant INT-8602537 and by the University Research Center of Boise State University under Accounts 681-A015 and 681-A036 for the first author and by CONICYT and D.I.Bof the Universidad de chile for the second author.

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