@article{GDZPPN001263374, title = {Nonlinear perturbations of postive semigroups.}, journal = {Semigroup forum}, volume = {48}, year = {1994}, pages = {273-302}, zbl = {0835.47024}, url = {http://dml.mathdoc.fr/item/GDZPPN001263374} }
Sikic, H. Nonlinear perturbations of postive semigroups.. Semigroup forum, Tome 48 (1994) pp. 273-302. http://gdmltest.u-ga.fr/item/GDZPPN001263374/