@article{DMGT_2000_20_2_a7,
     author = {Galeana-S\'anchez, Hortensia and Garc{\'\i}a-Ruvalcaba, Jos\'e},
     title = {Kernels in the closure of coloured digraphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {243--254},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2000_20_2_a7/}
}