TY  - JOUR
AU  - Humphries, Stephen P.
TI  - Free products in mapping class groups generated by Dehn twists
JO  - Glasgow mathematical journal
PY  - 1989
SP  - 213
EP  - 218
VL  - 31
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S001708950000776X/
DO  - 10.1017/S001708950000776X
ID  - 10_1017_S001708950000776X
ER  -