1. On the stability of motion in the presence of impulses;Millman;Siberian Math. J.,1960
2. Random impulses in linear dynamic systems, Approximate methods for solving differential equations;Millman;Akad. Nauk. Ukrain. SSR Inst. Mat. Preprint,1963
3. Operator of the moving on the trajectory of differential equations;Krasnoselski,1966