Velychko, Oleh, Sergii Shevkun, Tetyana Gordiyenko, and Oleh Mescheriak. “Interlaboratory Comparisons of the Calibration Results of Time Meters”. Eastern-European Journal of Enterprise Technologies 1, no. 9 (91) (January 16, 2018): 4–11. Accessed July 28, 2024. https://journals.uran.ua/eejet/article/view/121089.