MALECZEK, Stanisław. Optimisation of the total harmonic distortions of the acoustic vacuum tube push-pull amplifier. Archives of Acoustics, [S. l.], v. 33, n. 1, p. 103–109, 2014. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/636. Acesso em: 26 apr. 2025.