@Article{109493,
     author = "Grażyna Rosińska",
     title = "Decimal positional fractions : their use for the surveying purposes, Ferrara 1442 ",
     year =  1995,
     volume =  40,
     number =  4,
     journal =  Kwartalnik Historii Nauki i Techniki,
     pages =  s. 17-32,
    }