%0 Journal Article %A Matsumoto, Naoki %A Suzuki, Yusuke %T Non-1-Planarity of Lexicographic Products of Graphs %J Discussiones Mathematicae. Graph Theory %D 2021 %P 1103-1114 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2021_41_4_a15/ %G en %F DMGT_2021_41_4_a15