1. System Identification: A Survey;ASTROM;Automatica,1971
2. M. CUENOD and A. P. SAGE, Comparison of Some Methods Used for Process Identification, in Identification in Automatic Control Systems, IFAC, 1967.
3. A. V. BALAKRISHNAN, and V. PETERKA, Identification in Automatic Control Systems, in Fourth Congress of IFAC, Warsaw, 1969.
4. “Quasilinearization and Nonlinear Boundary Value Problems,”;BELLMAN,1965
5. On Structural Identifiability;BELLMAN;Mathematical Biosciences,1970