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@article{PORMA_1989__46_1_115653, author = {Almeida, P.}, title = {A direct approach to one variable noncommutative calculus}, journal = {Portugaliae mathematica}, pages = {97--114}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1989}, mrnumber = {0996405}, zbl = {0677.22006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_1_115653/} }
Almeida, P. A direct approach to one variable noncommutative calculus. Portugaliae mathematica, Tome 46 (1989) no. 1, pp. 97-114. http://geodesic.mathdoc.fr/item/PORMA_1989__46_1_115653/