Problems (Szeged Colloquium).
L. Márki (1988)
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L. Márki (1988)
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O. Steinfeld (1971)
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M. Gould (1977/78)
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B.M. Schein (1975)
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P.E. Conner (1974)
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D.R. Brown, A.R. Stralka (1974)
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M. Friedberg (1972)
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I.S. Ponizovskii (1983)
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B. Fuchssteiner (1976/77)
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J.E. Pin (1986-1987)
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L.N. Shevrin (1972)
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