@article{GDZPPN002093669, title = {Perturbation of Operator Algebras.}, journal = {Inventiones mathematicae}, volume = {41}, year = {1977}, pages = {1-14}, zbl = {0366.46050}, url = {http://dml.mathdoc.fr/item/GDZPPN002093669} }
Christensen, Erik. Perturbation of Operator Algebras.. Inventiones mathematicae, Tome 41 (1977) pp. 1-14. http://gdmltest.u-ga.fr/item/GDZPPN002093669/