Maciuk, Kamil, Inese Varna, and Jacek Kudrys. “Progression of Clock DBD Changes over Time”. Metrology and Measurement Systems 30, no. 3 (September 30, 2023): 499–505. Accessed October 15, 2026. https://wydawnictwo.pan.pl/index.php/mms/article/view/5229.