@article{oai:tsukuba.repo.nii.ac.jp:00018389,
 author = {Ando, Naoya},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {223--243},
 title = {Parallel curved surfaces},
 volume = {28},
 year = {2004}
}