Jain A, Khan F, Gupta P, Gupta K, Yadav SR. CHALLENGES FACED IN PPP AND HAM MODEL AND THE NEED FOR AN ALTERNATIVE. JCEST [Internet]. 2019Sep.29 [cited 2024Apr.26];10(2):93-104. Available from: https://publisher.unimas.my/ojs/index.php/JCEST/article/view/1407