@article{ZNSL_1974_40_a2,
     author = {G. V. Davydov and P. Yu. Suvorov},
     title = {A~reduction of proposittional tautologihood to graph-coloring in three colors},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {10--13},
     publisher = {mathdoc},
     volume = {40},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_40_a2/}
}