Laura Ciobanu, Alan D. Logan. The Post Correspondence Problem and Equalisers for Certain Free Group and Monoid Morphisms. In Artur Czumaj, Anuj Dawar, Emanuela Merelli, editors, 47th International Colloquium on Automata, Languages, and Programming, ICALP 2020, July 8-11, 2020, Saarbrücken, Germany (Virtual Conference). Volume 168 of LIPIcs, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020. [doi]