Wu C, Wang S, Yuan J, Li C, Zhang Q. A prediction model of specific productivity index using least square support vector machine method. Adv. Geo-Energy Res. [Internet]. 2020 Dec. 16 [cited 2026 Mar. 14];4(4):460-7. Available from: https://ager.yandypress.com/index.php/2207-9963/article/view/142