Geodesic
A Note on Undirected Graphs Realizable as P.O. Sets
Canadian mathematical bulletin, Tome 13 (1970) no. 3, pp. 371-374

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Let (P, ≥) be a p.o. set. The basis graph of (P, ≥) is defined to be the directed graph whose vertex set is P and in which the ordered pair 〈a, b〉 is an edge if and only if b covers a in (P, ≥).Let D be a directed graph. All graphs considered in this note are finite and are free of loops and multiple edges. 
Haff, C. E.; Murty, U. S. R.; Wilton, R. C. A Note on Undirected Graphs Realizable as P.O. Sets. Canadian mathematical bulletin, Tome 13 (1970) no. 3, pp. 371-374. doi: 10.4153/CMB-1970-070-6
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     author = {Haff, C. E. and Murty, U. S. R. and Wilton, R. C.},
     title = {A {Note} on {Undirected} {Graphs} {Realizable} as {P.O.} {Sets}},
     journal = {Canadian mathematical bulletin},
     pages = {371--374},
     year = {1970},
     volume = {13},
     number = {3},
     doi = {10.4153/CMB-1970-070-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-070-6/}
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