@article{10_37236_4265,
     author = {Robert Lukot'ka and J\'an Maz\'ak and Xuding Zhu},
     title = {Maximum 4-degenerate subgraph of a planar graph},
     journal = {The electronic journal of combinatorics},
     year = {2015},
     volume = {22},
     number = {1},
     doi = {10.37236/4265},
     zbl = {1305.05056},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4265/}
}