@article{10_4153_CJM_1971_016_5,
     author = {Pnueli, A. and Lempel, A. and Even, S.},
     title = {Transitive {Orientation} of {Graphs} and {Identification} of {Permutation} {Graphs}},
     journal = {Canadian journal of mathematics},
     pages = {160--175},
     year = {1971},
     volume = {23},
     number = {1},
     doi = {10.4153/CJM-1971-016-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-016-5/}
}