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@article{PORMA_1973__32_1_115190, author = {Schutte, H.J. and Wessels, S.F.G.}, title = {Contributions to the theory of (1,1) rings}, journal = {Portugaliae mathematica}, pages = {59--69}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {1973}, mrnumber = {0323841}, zbl = {0255.17001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1973__32_1_115190/} }
Schutte, H.J.; Wessels, S.F.G. Contributions to the theory of (1,1) rings. Portugaliae mathematica, Tome 32 (1973) no. 1, pp. 59-69. http://geodesic.mathdoc.fr/item/PORMA_1973__32_1_115190/