%0 Journal Article %A Dey, I. M. S. %T Schreier systems in free products %J Glasgow mathematical journal %D 1965 %P 61-79 %V 7 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S204061850003522X/ %R 10.1017/S204061850003522X %F 10_1017_S204061850003522X