TY  - JOUR 
T1  - Vector Constants of Motion for Time-Dependent Kepler and Isotropic Harmonic Oscillator Potentials
JO  - Brazilian Journal of Physics
A1  - Ritter, O.M.
A1  - Santos, F.C.
A1  - Tort, A. C.
SN  - 0103-9733
UL  - 10.1590/S0103-97332001000200024
VL  - 31 
Y1  - 2001
PB  - Brasil 
ER  -