@article{MS2_1994__75_2_167319,
     author = {L. H\"ormander and Anders Melin},
     title = {A {Remark} on {Perturbations} of {Compact} {Operators.}},
     journal = {Mathematica Scandinavica},
     pages = {255--262},
     publisher = {mathdoc},
     volume = {75},
     number = {2},
     year = {1994},
     zbl = {0824.47008},
     url = {http://geodesic.mathdoc.fr/item/MS2_1994__75_2_167319/}
}