Closed graphs are proper interval graphs
Analele Universităţii "Ovidius" Constanţa Seria Matematică, XXII (2014) no. 3.

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     author = {Marilena Crupi and Giancarlo Rinaldo},
     title = {Closed graphs are proper interval graphs},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXII},
     number = {3},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2014_XXII_3_a6/}
}
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Marilena Crupi; Giancarlo Rinaldo. Closed graphs are proper interval graphs. Analele Universităţii "Ovidius" Constanţa Seria Matematică, XXII (2014) no. 3. http://geodesic.mathdoc.fr/item/ASUO_2014_XXII_3_a6/