@article{10_4153_CJM_1966_070_2,
     author = {Nash-Williams, C. ST. J. A.},
     title = {Euler {Lines} in {Infinite} {Directed} {Graphs}},
     journal = {Canadian journal of mathematics},
     pages = {692--714},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-070-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-070-2/}
}