@Article{67366,
     author = "Grażyna Rosińska",
     title = "A chapter in the history of the Renaissance mathematics : negative numbers and the formulation of the law of sign (Ferrara, Italy ca. 1450) ",
     year =  1995,
     volume =  40,
     number =  1,
     journal =  Kwartalnik Historii Nauki i Techniki,
     pages =  s. 3-20,
    }