Ritonja, J., Petrun, M., Cernelic, J., Brezovnik, R. and Polajzer, B. 2016. Analysis and Applicability of Heffron–Phillips Model. Elektronika ir Elektrotechnika. 22, 4 (Aug. 2016), 3 - 10. DOI:https://doi.org/10.5755/j01.eie.22.4.15905.