%0 Journal Article %A A. Schinzel %A M. Skałba %T An improvement of a lemma from Gauss’s first proof of quadratic reciprocity %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2017 %P 29-33 %V 65 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba8109-4-2017/ %R 10.4064/ba8109-4-2017 %G en %F 10_4064_ba8109_4_2017