TY  - GEN
AU  - Longuski, James M. 
AU  - Hoots, Felix R.
AU  - Pollock IV, George E.
TI  - Introduction to orbital perturbations
T2  - Space Technology Library
SN  - 9783030897604
PY  - 2022///
CY  - Switzerland
PB  - Springer
KW  - planetary equations
KW  - variational equations
KW  - orbital perturbation
N1  - index given; ill
ER  -