@article{GDZPPN001260863, title = {Nonlinear perturbations of analytical semigroups.}, journal = {Semigroup forum}, volume = {43}, year = {1991}, pages = {127-146}, zbl = {0721.47052}, url = {http://dml.mathdoc.fr/item/GDZPPN001260863} }
Oharu, S. Nonlinear perturbations of analytical semigroups.. Semigroup forum, Tome 43 (1991) pp. 127-146. http://gdmltest.u-ga.fr/item/GDZPPN001260863/