[1] L. S. Pontrjagin:
Ordinary Differential Equations. Nauka, Moscow 1970. In Russian.
MR 0277788
[3] S. Čelikovský:
On the representation of trajectories of bilinear systems and its applications. Kybernetika 23 (1987), 3, 198-213.
MR 0900330
[4] J. Doležal, P. Černý: Methods of optimal control for practical determination of multifunctional catalysts. Automatizace 21 (1978), 1, 3-8. In Czech.
[5] E. P. Hofer: Optimierung eines katalytischen Rohrreaktors. Regelungstechnik 23 (1975), 109-117.
[6] F. P. Vasiljev: Methods of solving of extremal problems. Moscow 1981. In Russian.