John Harding, Mirko Navara Embeddings into Orthomodular Lattices with Given Centers, State Spaces and Automorphism Groups. [Citation Graph (0, 0)][DBLP] Order, 2000, v:17, n:3, pp:239-254 [Journal]
Josef Niederle Being a Proper Trapezoid Ordered Set Is a Comparability Invariant. [Citation Graph (0, 0)][DBLP] Order, 2000, v:17, n:3, pp:301-308 [Journal]
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