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@article{IM_1990__101_2_143795, author = {S. Popa}, title = {Classification of subfactors: the reduction to commuting squares.}, journal = {Inventiones mathematicae}, pages = {19--44}, publisher = {mathdoc}, volume = {101}, number = {2}, year = {1990}, zbl = {0757.46054}, url = {http://geodesic.mathdoc.fr/item/IM_1990__101_2_143795/} }
S. Popa. Classification of subfactors: the reduction to commuting squares.. Inventiones mathematicae, Tome 101 (1990) no. 2, pp. 19-44. http://geodesic.mathdoc.fr/item/IM_1990__101_2_143795/