@article{CM_1971__23_2_169_0,
     author = {Van Dulst, D.},
     title = {On strictly singular operators},
     journal = {Compositio Mathematica},
     pages = {169--183},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {2},
     year = {1971},
     mrnumber = {288621},
     zbl = {0212.46402},
     language = {en},
     url = {http://www.numdam.org/item/CM_1971__23_2_169_0/}
}