@article{10_21136_CMJ_2023_0418_21,
     author = {Song, Lili and Sun, Lei},
     title = {1-planar graphs with girth at least 6 are (1,1,1,1)-colorable},
     journal = {Czechoslovak Mathematical Journal},
     pages = {993--1006},
     publisher = {mathdoc},
     volume = {73},
     number = {4},
     year = {2023},
     doi = {10.21136/CMJ.2023.0418-21},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0418-21/}
}