Gössel, Michael, and Heinz D. Modrow. “Verallgemeinerte Superposition Bei binären Automaten”. Acta Cybernetica 3, no. 2 (January 1, 1977): 163-172. Accessed April 25, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3143.