TY  - JOUR
AU  - TERAMOTO, KEISUKE
TI  - FOCAL SURFACES OF WAVE FRONTS IN THE EUCLIDEAN 3-SPACE
JO  - Glasgow mathematical journal
PY  - 2019
SP  - 425
EP  - 440
VL  - 61
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089518000277/
DO  - 10.1017/S0017089518000277
ID  - 10_1017_S0017089518000277
ER  -