@article{ASNSP_1984_4_11_3_353_0,
     author = {Balog, A. and Perelli, A.},
     title = {Diophantine approximation by square-free numbers},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {353--359},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 11},
     number = {3},
     year = {1984},
     mrnumber = {785616},
     zbl = {0565.10029},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1984_4_11_3_353_0/}
}