A new generalization of a problem of F. Lukács
Compositio Mathematica, Tome 14 (1959-1960) , pp. 195-227. 
@article{CM_1959-1960__14__195_0,
     author = {Brickman, Louis},
     title = {A new generalization of a problem of F. Luk\'acs},
     journal = {Compositio Mathematica},
     pages = {195--227},
     publisher = {Kraus Reprint},
     volume = {14},
     year = {1959-1960},
     zbl = {0097.05001},
     mrnumber = {130521},
     language = {en},
     url = {http://www.numdam.org/item/CM_1959-1960__14__195_0/}
}
Brickman, Louis. A new generalization of a problem of F. Lukács. Compositio Mathematica, Tome 14 (1959-1960) , pp. 195-227. http://www.numdam.org/item/CM_1959-1960__14__195_0/

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