1. Systems of differential equations containing small parameters at derivatives;Tikhonov;Matem. Sb.,1952
2. Asymptotic Expansions of Solutions of Singularly Perturbed Equations;Vasil'eva,1973
3. On the possibility of realizing a nonholonomic constraint by means of viscous friction forces;Fufaev;PMM,1964
4. The connection between slippage and rotation friction and the allowance for it in the theory of the top;Contensou,1967
5. The Gyroscope;Magnus,1974