@article{10_5427_jsing_2015_12e,
     author = {Daisuke Kagatsume and Takashi Nishimura},
     title = {Aperture of plane curves},
     journal = {Journal of Singularities},
     pages = {80--91},
     publisher = {mathdoc},
     volume = {12},
     year = {2015},
     doi = {10.5427/jsing.2015.12e},
     url = {http://geodesic.mathdoc.fr/articles/10.5427/jsing.2015.12e/}
}