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Link to original content: https://dblp.uni-trier.de/rec/journals/jgt/Zhao00.xml
Yue Zhao 0008 3-Coloring graphs embedded in surfaces. 140-143 2000 33 J. Graph Theory 3 https://doi.org/10.1002/(SICI)1097-0118(200003)33:3<140::AID-JGT3>3.0.CO;2-3 db/journals/jgt/jgt33.html#Zhao00