1. Mathematics in Science and Engineering;J.H. Ahlberg,1967
2. Allemandou, P.: Low-pass filters approximating in modulus and phase the exponential function. IEEE Transactions on Circuit Theory 13, 298–301 (1966)
3. Arumugam, M., Ramamoorty, M.: A method of simplifying large dynamic systems. Int. J. Control 17, 1129–1135 (1973)
4. Bockowska, M., Orlowski, M., Zuchowski, A.: O pewnej metodzie wyznaczania parametrow uproszczonych, liniowych modeli dynamiki obiektow. Pomiary Automatyka Kontrola 12, 280–282 (1994)
5. Burden, R.L., Faires, J.D.: Numerical Analysis. PWS-KENT Publishing Company, Boston (1985)