Semigroups of mappings on graphs.
V.A. Molchanov (1983)
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V.A. Molchanov (1983)
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S. Armstrong (1984)
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D.J. Hansen (1986)
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A. Bobrowski (1997)
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L. Márki, J. Fountain, P.N. Anh (1996)
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A. Varisco, A. Cherubini (1986-1987)
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R.J. Warne (1997)
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S. Kantorovitz (1996)
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S. Satoh, K. Yama, M. Tokizawa (1994)
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E.M. Mogiljanskaja (1974)
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E.M. Norris (1977/78)
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E.E. Devun (1972)
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