On intersection and symmetric difference of families of boundary classes in the problems on colouring and on the chromatic number
Diskretnaya Matematika, Tome 24 (2012) no. 2, pp. 75-78

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     author = {D. S. Malyshev},
     title = {On intersection and symmetric difference of families of boundary classes in the problems on colouring and on the chromatic number},
     journal = {Diskretnaya Matematika},
     pages = {75--78},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2012_24_2_a5/}
}
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D. S. Malyshev. On intersection and symmetric difference of families of boundary classes in the problems on colouring and on the chromatic number. Diskretnaya Matematika, Tome 24 (2012) no. 2, pp. 75-78. http://geodesic.mathdoc.fr/item/DM_2012_24_2_a5/