@article{1031710532,
author = {Harary, Frank},
title = {On local balance and $N$-balance in signed graphs.},
journal = {Michigan Math. J.},
volume = {3},
number = {2},
year = {1955},
pages = { 37-41},
language = {en},
url = {http://dml.mathdoc.fr/item/1031710532}
}
Harary, Frank. On local balance and $N$-balance in signed graphs.. Michigan Math. J., Tome 3 (1955) no. 2, pp. 37-41. http://gdmltest.u-ga.fr/item/1031710532/