TY  - JOUR
AU  - Kamphorst, Sylvie Oliffson
AU  - Pinto-de-Carvalho, Sônia
TI  - The first Birkhoff coefficient and the stability of 2-periodic orbits on billiards.
JO  - Experimental mathematics
PY  - 2005
SP  - 299
EP  - 306
VL  - 14
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EXMA_2005__14_3_55277/
LA  - en
ID  - EXMA_2005__14_3_55277
ER  -