1. Image reducing words and subgroups of free groups;Ananichev;Theoret. Comput. Sci.,2003
2. An inverse automata algorithm for recognizing 2-collapsing words;Ananichev,2003
3. Quest for short synchronizing words and short collapsing words;Ananichev,2003
4. A combinatorial approach to collapsing words;Cherubini,2006