@article{MOMA_1991__112_3_178543,
     author = {B.P. Duggal},
     title = {A {Remark} on {Normal} {Derivations} of {Hilbert-Schmidt} {Type.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {265--270},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {1991},
     zbl = {0737.47021},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1991__112_3_178543/}
}