LI, Rongkang. Grey Relational Analysis of the Correlation between Various Crop Yields and Annual Precipitation in Henan Province Over the Last Decade. International Core Journal of Engineering, [S. l.], v. 12, n. 2, p. 24–36, 2026. DOI: 10.6919/ICJE.202602_12(2).0004. Disponível em: https://icj-e.org/index.php/ojs/article/view/220. Acesso em: 15 apr. 2026.