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Published in Algebra i Logika, Vol. 7, No. 5, pp. 109–116, September–October, 1968.
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Shafaat, A. Clusters of algebra. Algebr Logic 7, 353–356 (1968). https://doi.org/10.1007/BF02219288
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DOI: https://doi.org/10.1007/BF02219288