An extension theorem for planar semimodular lattices
Crossref DOI link: https://doi.org/10.1007/s10998-014-0035-2
Published Online: 2014-08-26
Published Print: 2014-09
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Grätzer, G.
Schmidt, E. T.
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