Ojala, Leo; Penttinen, Olli-Matti; Parviainen, Elina (2004), "Modeling and Analysis of Margolus Quantum Cellular Automata Using Net-Theoretical Methods", Applications and Theory of Petri Nets 2004, Lecture Notes in Computer Science, vol. 3099, Springer-Verlag, pp. 331–350, doi:10.1007/978-3-540-27793-4_19, ISBN978-3-540-22236-1