OPILSKA L, OPILSKI A, LATACZ Z. Relation between the energy. Gap and ultrasonic wave propagation velocities in semiconductors. Arch. Acoust. [Internet]. 2016 Mar. 7 [cited 2025 Apr. 26];5(1):81-90. Available from: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3329