| Aizicovici S. Degree theory for operators of monotone type and nonlinear elliptic equations with inequality constraints / S.Aizicovici, N.S.Papageorgiou, V.Staicu. - Providence: American Mathematical Society, 2008. - vi, 70 p. - (Memoirs of the American Mathematical Society; Vol.196, N 915). - Bibliogr.: p.69-70. - ISBN 978-0-8218-4192-1; ISSN 0065-9266
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