YU, T. The Doppler Frequency Shift Formula Derived by Directly Differentiating the Wave Speed Formula. European Journal of Applied Sciences, [S. l.], v. 12, n. 2, p. 78–83, 2024. DOI: 10.14738/aivp.122.16567. Disponível em: https://journals.scholarpublishing.org/index.php/AIVP/article/view/16567. Acesso em: 15 may. 2024.