1. Necessary and sufficient conditions for the weak invariancy;Khrustalev;Automation and Remote Control,1968
2. Application of the invariancy theory to the control Problems of the descent into the atmosphere;Khrustalev,1974
3. The invariancy principle and conditions of its applicability to the linear and nonlinear system design;Petrov,1961
4. A variational approach to the problem of invariancy for the automatical control system;Rosonoher;Automation and Remote control,1967
5. A variational approach to the problem of invariancy for the automatical control system;Rosonoher;Automation and Remote control,1967