1.
ŁĘTOWSKI T, ZIMAK L, CIOŁKOSZ-ŁUPINOWA H. Timbre differences of an individual voice in solo and in choral singing. Arch. Acoust. 2015;13(1-2):55-65. Accessed June 10, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3061