@article{10_5427_jsing_2014_10r,
     author = {Kentaro Saji},
     title = {Koenderink type theorems for fronts},
     journal = {Journal of Singularities},
     pages = {264--270},
     publisher = {mathdoc},
     volume = {10},
     year = {2014},
     doi = {10.5427/jsing.2014.10r},
     url = {http://geodesic.mathdoc.fr/articles/10.5427/jsing.2014.10r/}
}