@article{MZ_1971__123_171642,
     author = {Lawrence Crone},
     title = {A {Characterization} of {Matrix} {Operators} on l2.},
     journal = {Mathematische Zeitschrift},
     pages = {315--317},
     publisher = {mathdoc},
     volume = {123},
     year = {1971},
     zbl = {0212.16004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__123_171642/}
}