@article{MAN_1976__220_162815,
     author = {Earl Berkson and Richard J. Fleming and James Jamison},
     title = {Groups of {Isometries} on {Certain} {Ideals} of {Hubert}  {Space} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {151--156},
     publisher = {mathdoc},
     volume = {220},
     year = {1976},
     zbl = {0305.47024},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__220_162815/}
}