@article{DMGT_2000_20_2_a3,
     author = {Neumann-Lara, V{\'\i}ctor},
     title = {Dichromatic number, circulant tournaments and {Zykov} sums of digraphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {197--207},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2000_20_2_a3/}
}