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The "graph classes: a survey" mentioned Trotter and other authors have presented a list of forbidden subgraph of comparability graph. But the google book( where I read graph classes: a survey) do not have the page which contains the reference of specific literature. To my knowledge, one forbidden graph is "a k-cycle ( k is an odd intege $\ge$ 5) and no triangle chord".

Thank you for your help in advance. :-)

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You could refer to the entry for comparability graphs on graphclasses.org: http://www.graphclasses.org/classes/gc_72.html (look at "equivalent classes" and note that the list is not finite)

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Although Stefan is right, the infinite part is simply "odd-hole-free". The list also has helpful links to pictures of all the other excluded graphs. –  András Salamon Dec 3 '12 at 18:57
    
No, András, every one of those "n"s in the exponents of many of the forbidden configurations are arbitrary parameters ... each one of those XF^ symbols is an infinite family of graphs. Also, the subscript $n$ for co-holes is another infinite set of forbidden graphs. It's not only the odd holes. –  Jim Nastos Feb 19 at 18:34
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You must be referring to page 91 of that book. The reference is T. GALLAI, Transitiv orientierbare Graphen, Acta Math. Acad. Sci. Hung., 18 (1967), 25-66. A translation exists, but I was unable to find it online.

The list is apparently also available in W.T. TROTTER, JR., Combinatorics and Partially Ordered Sets — Dimension Theory, Johns Hopkins University Press, Baltimore, London (1992).

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The translation can be obtained from F. Maffray by an email request, that's how I got it myself. Be warned that the paper is a difficult read though (44p long, a number that doesn't bode well to me..) –  HeloLobo Apr 3 at 11:51
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