Multiple periodic solutions for first-order ordinary differential equations

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS

10.1016/0022-247X(87)90123-5

WOS:A1987K902200014

http://hdl.handle.net/20.500.11767/86320

info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-38249035236

https://www.sciencedirect.com/science/article/pii/0022247X87901235?via%3Dihub

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