@article{DMGT_1998_18_1_a6,
     author = {Galeana-S\'anchez, Hortensia and Neumann-Lara, V.},
     title = {New classes of critical kernel-imperfect digraphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {85--89},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_1998_18_1_a6/}
}