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@article{PORMA_1983__42_3_115543, author = {Marchi, Ezio}, title = {A von {Neumann} model with an arbitrary number of steps}, journal = {Portugaliae mathematica}, pages = {277--286}, publisher = {mathdoc}, volume = {42}, number = {3}, year = {1983}, mrnumber = {0819907}, zbl = {0581.90018}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_3_115543/} }
Marchi, Ezio. A von Neumann model with an arbitrary number of steps. Portugaliae mathematica, Tome 42 (1983) no. 3, pp. 277-286. http://geodesic.mathdoc.fr/item/PORMA_1983__42_3_115543/