@article{10_4064_ba8109_4_2017,
     author = {A. Schinzel and M. Ska{\l}ba},
     title = {An improvement of a lemma from {Gauss{\textquoteright}s} first proof of quadratic reciprocity},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {29--33},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2017},
     doi = {10.4064/ba8109-4-2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba8109-4-2017/}
}