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@article{PORMA_1977__36_2_115305, author = {Showalter, R.E.}, title = {Perturbation of maximal accretive operators with right angle}, journal = {Portugaliae mathematica}, pages = {79--82}, publisher = {mathdoc}, volume = {36}, number = {2}, year = {1977}, mrnumber = {0577413}, zbl = {0431.47017}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115305/} }
Showalter, R.E. Perturbation of maximal accretive operators with right angle. Portugaliae mathematica, Tome 36 (1977) no. 2, pp. 79-82. http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115305/