CHORNYI, S.G.; VILNA (POLIASHENKO), N.V. Updating of "The Productivity Index of Pierce» and its application for an estimation of chernozem soils quality in the Right-bank Steppe of Ukraine. AgroChemistry and Soil Science, [S. l.], v. 88, p. 31–39, 2019. DOI: 10.31073/acss88-04. Disponível em: https://agrochemsoilsci.org/index.php/journal/article/view/93.. Acesso em: 8 jul. 2026.