@article{10_4064_sm_38_1_279_284,
     author = {Bernard Gelbaum},
     title = {On a class of operators in {Hilbert} space},
     journal = {Studia Mathematica},
     pages = {279--284},
     year = {1970},
     volume = {38},
     number = {1},
     doi = {10.4064/sm-38-1-279-284},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-38-1-279-284/}
}