@article{1195519569, author = {Yoshikawa, Atsushi}, title = {Note on singular perturbation of linear operators}, journal = {Proc. Japan Acad.}, volume = {48}, number = {10}, year = {1972}, pages = { 595-598}, language = {en}, url = {http://dml.mathdoc.fr/item/1195519569} }
Yoshikawa, Atsushi. Note on singular perturbation of linear operators. Proc. Japan Acad., Tome 48 (1972) no. 10, pp. 595-598. http://gdmltest.u-ga.fr/item/1195519569/