@article{GDZPPN00205907X, title = {Operational Calculus for Two Commuting Closed Operators.}, journal = {Commentarii mathematici Helvetici}, volume = {43}, year = {1968}, pages = {87-97}, zbl = {0155.46103}, url = {http://dml.mathdoc.fr/item/GDZPPN00205907X} }
Marti, J.T. Operational Calculus for Two Commuting Closed Operators.. Commentarii mathematici Helvetici, Tome 43 (1968) pp. 87-97. http://gdmltest.u-ga.fr/item/GDZPPN00205907X/