@article{MASLO_1977_27_1_a4,
author = {Behzad, Mehdi and Harary, Frank},
title = {Which directed graphs have a solution?},
journal = {Mathematica slovaca},
pages = {37--42},
year = {1977},
volume = {27},
number = {1},
mrnumber = {0469809},
zbl = {0368.05027},
language = {en},
url = {http://geodesic.mathdoc.fr/item/MASLO_1977_27_1_a4/}
}
Behzad, Mehdi; Harary, Frank. Which directed graphs have a solution?. Mathematica slovaca, Tome 27 (1977) no. 1, pp. 37-42. http://geodesic.mathdoc.fr/item/MASLO_1977_27_1_a4/
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