A small generating set for the twist subgroup of the mapping class group   of a non-orientable surface by Dehn twists
  We give a small generating set for the twist subgroup of the mapping class group of a non-orientable surface by Dehn twists. The difference between the number of the generators and a lower bound of numbers of generators for the twist subgroup by Dehn twists is one. The lower bounds is obtained from an argument of Hirose [5]. 
Genki Omori
math.GT math.GR