KLESZCZEWSKI, Z. “Making Use of Bragg’s Diffraction for Investigations of the Acoustic Activity of Bismuth-Germanium Oxide”. Archives of Acoustics 15, no. 3-4 (May 1, 2014): 367–374. Accessed April 26, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1295.