Stoicuta , Olimpiu, Nadia Stoicuta, и Teodor Pana. 2009. "Small Speed Asymptotic Stability Study of a Speed Vector Control System for an Induction Motor That Contains in Its Loop a Gopinath Observer". Записки Горного института 181 (март), 115-22. https://pmi.spmi.ru/pmi/article/view/7043.

Stoicuta , Olimpiu, Nadia Stoicuta, and Teodor Pana. 2009. "Small Speed Asymptotic Stability Study of a Speed Vector Control System for an Induction Motor That Contains in Its Loop a Gopinath Observer". Journal of Mining Institute 181 (March), 115-22. https://pmi.spmi.ru/pmi/article/view/7043.