@article{oai:ynu.repo.nii.ac.jp:00009069,
 author = {Kawasaki, Yuki and Nakamoto, Atsuhiro},
 journal = {Yokohama Mathematical Journal},
 month = {},
 pages = {75--90},
 title = {N-Flips in even triangulations on the projective plane preserving chromatic number},
 volume = {63},
 year = {2017}
}