@article{10_4153_CMB_1967_040_0,
     author = {Harary, Frank and Palmer, Edgar and Smith, Cedric},
     title = {Which {Graphs} have only {Self-Converse} {Orientations?}},
     journal = {Canadian mathematical bulletin},
     pages = {425--429},
     year = {1967},
     volume = {10},
     number = {3},
     doi = {10.4153/CMB-1967-040-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-040-0/}
}