Youssef AH, Abonazel MR, Gamal E. Robust M Estimation for Poisson Panel Data Model with Fixed Effects: Method, Algorithm, Simulation, and Application. Stat., optim. inf. comput. [Internet]. 2024Jun.3 [cited 2024Jul.22];. Available from: http://iapress.org/index.php/soic/article/view/1996