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Petryshyn, W.V. (1981). Fixed points and surjectivity theorems via the A-proper mapping theory with application to differential equations. In: Fadell, E., Fournier, G. (eds) Fixed Point Theory. Lecture Notes in Mathematics, vol 886. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0092193
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DOI: https://doi.org/10.1007/BFb0092193
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