ŁĘTOWSKI T, ZIMAK L, CIOŁKOSZ-ŁUPINOWA H. Timbre differences of an individual voice in solo and in choral singing. Arch. Acoust. [Internet]. 2015 Jul. 10 [cited 2025 Apr. 25];13(1-2):55-6. Available from: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3061