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Le equazioni funzionali in analisi non lineare Antonio Ambrosetti (2002) Bollettino dell'Unione Matematica Italiana
Lie generators for one parameter semigroups of transformations. J.W. Neuberger (1973) Journal für die reine und angewandte Mathematik
Linear complementarity problem and extremal hyperplanes Rudolf Švarc (1987) Commentationes Mathematicae Universitatis Carolinae
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