Generalized perturbation equations of celestial mechanics in terms of
orbital elements are derived. The most general case is considered: Kep
lerian motion of two bodies caused by gravitational forces between the
m is disturbed by disturbing acceleration acting on each of the bodies
separately and by changes of masses of these bodies. It is also point
ed out why derivation presented in Klacka (1992a) is completely physic
ally correct only for constant masses.