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@article{PORMA_1992__49_3_115791, author = {Schmeelk, John and Takaci, Arpad}, title = {Ultra annihilation and creation operators}, journal = {Portugaliae mathematica}, pages = {263--279}, publisher = {mathdoc}, volume = {49}, number = {3}, year = {1992}, mrnumber = {1201291}, zbl = {0771.46040}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1992__49_3_115791/} }
Schmeelk, John; Takaci, Arpad. Ultra annihilation and creation operators. Portugaliae mathematica, Tome 49 (1992) no. 3, pp. 263-279. http://geodesic.mathdoc.fr/item/PORMA_1992__49_3_115791/