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Dedicated to Alfred Tarski on his 80th birthday
The work of the second author falls under the scope of the Italian C.N.R.'s Mathematical Committee.
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Gumm, H.P., Ursini, A. Ideals in universal algebras. Algebra Universalis 19, 45–54 (1984). https://doi.org/10.1007/BF01191491
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DOI: https://doi.org/10.1007/BF01191491