Further remark on a theorem by E. M. Landesman and A. C. Lazer
Svatopluk Fučík (1974)
Commentationes Mathematicae Universitatis Carolinae
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Svatopluk Fučík (1974)
Commentationes Mathematicae Universitatis Carolinae
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Josef Voldřich (1982)
Commentationes Mathematicae Universitatis Carolinae
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Walter Petry (1974)
Commentationes Mathematicae Universitatis Carolinae
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