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Bloom Stephen L.; Tindell Ralph: A note on zero-congruences. In: Acta cybernetica, (8) 1. pp. 1-4. (1987)
Bloom Stephen L.: The alternation number and a dot hierarchy of regular sets. In: Acta cybernetica, (7) 4. pp. 355-359. (1986)
Bloom Stephen L.: Frontiers of one-letter languages. In: Acta cybernetica, (7) 1. pp. 1-18. (1985)