TY  - JOUR
AU  - Romero Fuster, Maria del Carmen
AU  - Ruas, Maria Aparecida Soares
TI  - Some stability questions concerning caustics for different propagation laws.
JO  - Portugaliae mathematica
PY  - 1994
SP  - 595
EP  - 605
VL  - 51
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1994__51_4_47286/
LA  - en
ID  - PORMA_1994__51_4_47286
ER  -