@InProceedings{bell_et_al:LIPIcs.MFCS.2019.70,
author = {Bell, Paul C. and Hirvensalo, Mika},
title = {{Acceptance Ambiguity for Quantum Automata}},
booktitle = {44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019)},
pages = {70:1--70:14},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-117-7},
ISSN = {1868-8969},
year = {2019},
volume = {138},
editor = {Rossmanith, Peter and Heggernes, Pinar and Katoen, Joost-Pieter},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.MFCS.2019.70},
URN = {urn:nbn:de:0030-drops-110149},
doi = {10.4230/LIPIcs.MFCS.2019.70},
annote = {Keywords: Quantum finite automata, matrix freeness, undecidability, Post’s correspondence problem, quaternions}
}