@article{10_4153_CJM_2004_020_2, author = {Rosenblatt, Joseph and Taylor, Michael}, title = {Group {Actions} and {Singular} {Martingales} {II,} {The} {Recognition} {Problem}}, journal = {Canadian journal of mathematics}, pages = {431--448}, year = {2004}, volume = {56}, number = {2}, doi = {10.4153/CJM-2004-020-2}, url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-020-2/} }