@article{202103.0348,
	doi = {10.20944/preprints202103.0348.v1},
	url = {https://doi.org/10.20944/preprints202103.0348.v1},
	year = 2021,
	month = {March},
	publisher = {Preprints},
	author = {Mateusz Gawlik and Wiesław Wszołek},
	title = {Passaggio Peak Coefficient as an Indicator of Singer Advancement},
	journal = {Preprints}
}