SINGHAL, R. M.; KUMAR, Pramod. Electrophoretic Fractionation of the Soil Humic Acids of Chakrata Himalayas (U.P.). Indian Forester, [S. l.], v. 120, n. 3, p. 262–267, 1994. DOI: 10.36808/if/1994/v120i3/7553. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/7553. Acesso em: 10 jul. 2025.