TY  - JOUR
AU  - Long, Yiming
TI  - The minimal period problem of classical hamiltonian systems with even potentials
JO  - Annales de l'I.H.P. Analyse non linéaire
PY  - 1993
SP  - 605
EP  - 626
VL  - 10
IS  - 6
PB  - Gauthier-Villars
UR  - http://www.numdam.org/item/AIHPC_1993__10_6_605_0/
LA  - en
ID  - AIHPC_1993__10_6_605_0
ER  -