1. Theory of Retracts;Borsuk,1967
2. Lectures on Mathematical Theory of Stability;Demidowitsch,1967
3. On the question of applicability of Ważewski's topological method;Diblḱ;Soviet Math. Dokl.,1985
4. The Theory of Matrices;Gantmacher,1967
5. Ordinary Differential Equations;Hartman,1964