@article{10_4064_ap_10_3_197_206,
     author = {B. Szafirski},
     title = {Sur une fonction extr\'emale li\'ee \`a l'\'ecart arithm\'etique d'un ensemble},
     journal = {Annales Polonici Mathematici},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1961},
     doi = {10.4064/ap-10-3-197-206},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-10-3-197-206/}
}