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2. On the openness and inversion of differentiable mappings;Bartle;Ann. Acad. Sci. Fenn. Ser. A. I,1958
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4. Existence in the large of periodic solutions of hyperbolic partial differential equations;Cesari;Arch. Rational Mech. Anal.,1965
5. Fixed Points and Topological Degree in Nonlinear Analysis;Cronin,1964