@article{oai:muroran-it.repo.nii.ac.jp:00009034,
 author = {FUKUNAGA, Tomonori and 福永, 知則 and TAKAHASHI,  Masatomo and 高橋, 雅朋},
 issue = {2},
 journal = {Kodai Mathematical Journal},
 month = {Jun},
 note = {application/pdf, We study convexity of simple closed frontals in the Euclidean plane by using the curvature of Legendre curves. We show that for a Legendre curve, the simple closed frontal is convex if and only if the sign of both functions of the curvature of the Legendre
curve does not change. We also give some examples of convex simple closed frontals.},
 pages = {389--398},
 title = {On convexity of simple closed frontals},
 volume = {39},
 year = {2016},
 yomi = {フクナガ, トモノリ and タカハシ, マサトモ}
}