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Variational equations of motion of the mechanical system of variable mass and their integration
Theoretical and applied mechanics, Tome 11 (1985) no. 1, p. 109
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The paper examines the variational equations of motion of a mechanical system of variable mass of the form $\ddot{\xi}^\gamma=A^\gamma_\delta(t)\xi^\gamma+B^\gamma_\delta(t)\dot{\xi}^\delta$, $(\xi,\delta=1,\dots,n)$. Here it is shown how a discrete model of a linear system $x(t_{n+1})=E(t_n)x(t_n)+F(t_n)U$ be used to solve the variations $\xi^\gamma(t)$. 
@article{TAM_1985_11_1_a10,
     author = {Du\v{s}an J. Miki\v{c}i\'c},
     title = {Variational equations of motion of the mechanical system of variable mass and their integration},
     journal = {Theoretical and applied mechanics},
     pages = {109 },
     year = {1985},
     volume = {11},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1985_11_1_a10/}
}
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Dušan J. Mikičić. Variational equations of motion of the mechanical system of variable mass and their integration. Theoretical and applied mechanics, Tome 11 (1985) no. 1, p. 109 . http://geodesic.mathdoc.fr/item/TAM_1985_11_1_a10/