%0 Journal Article %A Staněk, Svatoslav %T On an algebraic structure of a group of phases %J Mathematica slovaca %D 1977 %P 423-430 %V 27 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1977__27_4_a8/ %G en %F MASLO_1977__27_4_a8