Wu* C, Shaopeng Wang, Jianwei Yuan, Chao Li, Qi Zhang. A prediction model of specific productivity index using least square support vector machine method. Adv. Geo-Energy Res. [Internet]. 2020 Dec. 16 [cited 2025 Nov. 4];4(4):460-7. Available from: https://ager.yandypress.com/index.php/2207-9963/article/view/142