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References
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To Professor Ph. Dwinger On the occasion of his 65th birthday
The research was supported by Z.W.O. of the Netherlands.
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Blok, W.J. The lattice of varieties of modal algebras is not strongly atomic. Algebra Universalis 11, 285–294 (1980). https://doi.org/10.1007/BF02483108
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DOI: https://doi.org/10.1007/BF02483108