“The Main Characteristics of SiGe HBTs at Low Temperatures”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 66 (September 30, 2016): 87–96. Accessed March 13, 2025. https://radap.kpi.ua/radiotechnique/article/view/1340.