Periodic optimization of hammerstein-type systems. - P. Valkó; G. A. Almásy (Autom., 1982)

An extended ode solver for sensitivity calculations. - P. Valkó; Sandor Vajda (Comput. Chem., 1984)

Direct and indirect least squares methods in continuous-time parameter estimation. - Sandor Vajda; P. Valkó; Keith R. Godfrey (Autom., 1987)