Yadav, Kalpana, Sanjay Yadav, and P. K. Dubey. “Metrological Investigation and Calibration of Reference Standard Block for Ultrasonic Non-Destructive Testing”. Metrology and Measurement Systems 29, no. 3 (September 30, 2022): 525–538. Accessed October 16, 2026. https://wydawnictwo.pan.pl/index.php/mms/article/view/5182.