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@article{SF_1994__48_3_135319, author = {H. Sikic}, title = {Nonlinear perturbations of postive semigroups.}, journal = {Semigroup forum}, pages = {273--302}, publisher = {mathdoc}, volume = {48}, number = {3}, year = {1994}, zbl = {0835.47024}, url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135319/} }
H. Sikic. Nonlinear perturbations of postive semigroups.. Semigroup forum, Tome 48 (1994) no. 3, pp. 273-302. http://geodesic.mathdoc.fr/item/SF_1994__48_3_135319/