Nguyen Thi Le Hien, Doan Thanh Dat. Design and assembly of an apparatus system based on the Villari effect for detecting stress concentration zone on ferromagnetic materials. PVJ [Internet]. 2021Jan.29 [cited 2026Jul.29];10:68 -75. Available from: http://www.pvj.com.vn/index.php/TCDK/article/view/395