A new method for the nonlinear approximation of signals. I. The optimal damping factor Jaromír Štěpán — 1986 Kybernetika
A new method for the nonlinear approximation of signals. II. The convergence problem Jaromír Štěpán — 1986 Kybernetika
The uncertainty problem in control theory. II. The internally robust procedures Jaromír Štěpán — 1990 Kybernetika