Antic, D., Z. Jovanovic, V. Nikolic, M. Milojkovic, S. Nikolic, and N. Dankovic. 2012. “Modelling of Cascade-Connected Systems Using Quasi-Orthogonal Functions”. Elektronika Ir Elektrotechnika 18 (10):3-8. https://doi.org/10.5755/j01.eee.18.10.3051.