References
Avann, S. P.: Application of the join-irreducible excess function to semi-modular lattices. Math. Ann.142, 345–354 (1961).
Birkhoff, G.: Lattice Theory, rev. ed. Am. Math. Soc. Colloquium Publications, New York 1948.
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Avann, S.P. Increases in the join-excess function in a lattice. Math. Ann. 154, 420–426 (1964). https://doi.org/10.1007/BF01375525
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DOI: https://doi.org/10.1007/BF01375525