@article{CM_1938__5__433_0,
     author = {Sidon, S.},
     title = {Nachtrag zu meiner {Arbeit} {{\textquotedblleft}\"Uber} unvollst\"andige {Orthogonalsysteme{\textquotedblright}}},
     journal = {Compositio Mathematica},
     pages = {433--434},
     publisher = {Johnson Reprint Corporation},
     volume = {5},
     year = {1938},
     zbl = {0018.30202},
     language = {de},
     url = {http://www.numdam.org/item/CM_1938__5__433_0/}
}