Warzec A, Marszalec M, Lusawa M. Verification of Staff Proficiency in the Calibration Laboratory on Voltage, Frequency, Resistance and Capacity Measurements. JTIT [Internet]. 2016 Dec. 30 [cited 2026 Jun. 2];66(4):94-101. Available from: https://jtit.pl/jtit/article/view/767