@article{MOMA_1958__62_177039,
     author = {Karl Prachar},
     title = {\"Uber die kleinste quadratfreie {Zahl} einer arithmetischen {Reihe.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {173--176},
     publisher = {mathdoc},
     volume = {62},
     year = {1958},
     zbl = {0083.03704},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1958__62_177039/}
}