@article{DMGT_2019_39_3_a1,
     author = {Czap, J\'ulius and \v{S}ugerek, Peter and Jendrol{\textquoteright}, Stanislav and Valiska, Juraj},
     title = {Facial {[r,s,t]-Colorings} of {Plane} {Graphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {629--645},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2019_39_3_a1/}
}