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© 1981 Springer-Verlag
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Willem, M. (1981). Variational methods and almost solvability of semilinear equations. In: Everitt, W.N., Sleeman, B.D. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 846. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0089854
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DOI: https://doi.org/10.1007/BFb0089854
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