@article{MS2_1972__30_251803,
     author = {Donald Sarason},
     title = {An {Addendum} to },
     journal = {Mathematica Scandinavica},
     pages = {62--64},
     publisher = {mathdoc},
     volume = {30},
     year = {1972},
     zbl = {0266.60023},
     url = {http://geodesic.mathdoc.fr/item/MS2_1972__30_251803/}
}