%0 Journal Article
%A Humphries, Stephen P.
%T Free products in mapping class groups generated by Dehn twists
%J Glasgow mathematical journal
%D 1989
%P 213-218
%V 31
%N 2
%U http://geodesic.mathdoc.fr/articles/10.1017/S001708950000776X/
%R 10.1017/S001708950000776X
%F 10_1017_S001708950000776X