@article{oai:meiji.repo.nii.ac.jp:00000064,
 author = {杉原, 厚吉},
 journal = {Asia Pacific Mathematics Newsletter},
 month = {Jan},
 pages = {1--5},
 title = {Spatial Realization of Escher’s Impossible World},
 volume = {1},
 year = {2011}
}