@article{oai:tsukuba.repo.nii.ac.jp:00018587,
 author = {Yoshino, Masafumi},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {389--399},
 title = {Diophantine phenomena in commuting vector fields and diffeomorphisms},
 volume = {28},
 year = {2004}
}