%0 Journal Article %A Andrzej Prószy/nski %T Relations between Elements $r^{2}-r$ %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2007 %P 317-323 %V 55 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba55-4-3/ %R 10.4064/ba55-4-3 %G en %F 10_4064_ba55_4_3