Gonçalves JN, T. Monteiro MT, Sofia Rodrigues H. On the Dynamics of a Viral Marketing Model with Optimal Control using Indirect and Direct Methods. Stat., optim. inf. comput. [Internet]. 2018Nov.2 [cited 2024Nov.15];6(4):633-44. Available from: http://47.88.85.238/index.php/soic/article/view/20181212