@article{DMGT_2021_41_4_a15,
     author = {Matsumoto, Naoki and Suzuki, Yusuke},
     title = {Non-1-Planarity of {Lexicographic} {Products} of {Graphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {1103--1114},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2021_41_4_a15/}
}