Some examples of clans.
M. Friedberg (1972)
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M. Friedberg (1972)
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G. Thierrin (1974)
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M. Friedberg, J.W. Stepp (1974)
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S. Subbiah (1974)
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J.E. Pin (1986-1987)
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I.S. Ponizovskii (1983)
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H.J. Shyr, C. M. Reis (1977)
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P.E. Conner (1974)
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D.R. Brown, A.R. Stralka (1974)
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B. Fuchssteiner (1976/77)
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