@article{10_37236_4227,
     author = {Istv\'an Kov\'acs and G\'eza T\'oth},
     title = {Multiple coverings with closed polygons},
     journal = {The electronic journal of combinatorics},
     year = {2015},
     volume = {22},
     number = {1},
     doi = {10.37236/4227},
     zbl = {1308.52014},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4227/}
}