TY  - JOUR
AU  - Kentaro Saji
AU  - Masaaki Umehara
AU  - Kotaro Yamada
TI  - The geometry of fronts
JO  - Annals of mathematics
PY  - 2009
SP  - 491
EP  - 529
VL  - 169
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.169.491/
DO  - 10.4007/annals.2009.169.491
LA  - en
ID  - 10_4007_annals_2009_169_491
ER  -