@article{MS2_1984__55_166910,
     author = {Yoshikazu Katayama},
     title = {Takesaki's duality for a non-degenerate co-action.},
     journal = {Mathematica Scandinavica},
     pages = {141--151},
     publisher = {mathdoc},
     volume = {55},
     year = {1984},
     zbl = {0598.46042},
     url = {http://geodesic.mathdoc.fr/item/MS2_1984__55_166910/}
}