Maslov, O. Y.; Kolisnyk, S. V.; Kostina, T. A.; Shovkova, Z. V.; Ahmedov, E. Y.; Komisarenko, M. A. Validation of the Alkalimetry Method for the Quantitative Determination of Free Organic Acids in Raspberry Leaves. J. Org. Pharm. Chem. 2021, 19, 53-58.