Computing the Closure of Sets of Words Under Partial Commutations.

Yves Métivier Gwénaël Richomme Pierre-André Wacrenier Computing the Closure of Sets of Words Under Partial Commutations. 75-86 1995 conf/icalp/1995 ICALP db/conf/icalp/icalp95.html#MetivierRW95 http://dx.doi.org/10.1007/3-540-60084-1_64