Mizitova, A., Sediuk, I., Kopeliuk, O., Cherednychenko, O. and Pidporinova, K. 2023. The four-hand ensembles by Ludwig van Beethoven: search and gain. Amazonia Investiga. 12, 67 (Aug. 2023), 337–351. DOI:https://doi.org/10.34069/AI/2023.67.07.30.