BABU, P. N. R. R. B. K. N. Morphometrical studies on black pepper (Piper nigrum L.). II. principal component analysis of black pepper cultivars. Journal of Spices and Aromatic Crops, [S. l.], v. 6, n. 1, p. 21–29, 1997. Disponível em: https://www.updatepublishing.com/journal/index.php/josac/article/view/4391. Acesso em: 5 oct. 2025.