Demonstratio Mathematica > 2008 > Vol. 41, nr 2 > 263-272
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journal ISSN : | 2391-4661 |
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Bibliography
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[1] I. Chajda and K. Glazek, A Basic Course on General Algebra, Technical University Press, Zielona Góra, Poland 2000.
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[2] G. Grätzer, Universal Algebra, 2nd ed., Springer-Verlag, New York-Heidelberg-Berlin 1979.
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[3] G. Grätzer and A. Kisielewicz, A survey of some open problems on pn-sequences and free spectra of algebras and varieties, in: A. Romanowska and J. D. H. Smith (Eds.), "Universal Algebra and Quasigroup Theory", Helderman Verlag, Berlin 1992 57-88.