Zhao, Yizhen, Xinhua Wang, Yingchun Chen, Haiyang Ju, and Yi Shuai. “Non-Contact Harmonic Detection of Ferromagnetic Material Defects Based on SQGSR and OPLTF”. Metrology and Measurement Systems 28, no. 1 (March 30, 2021): 55–72. Accessed October 15, 2026. https://wydawnictwo.pan.pl/index.php/mms/article/view/5105.