%0 Journal Article %A MASBAUM, GREGOR %T ON POWERS OF HALF-TWISTS IN M(0, 2n) %J Glasgow mathematical journal %D 2018 %P 333-338 %V 60 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089517000143/ %R 10.1017/S0017089517000143 %F 10_1017_S0017089517000143