Youssef , A. H., Abonazel, M. R. and Ahmed, E. G. (2024) “Robust M Estimation for Poisson Panel Data Model with Fixed Effects: Method, Algorithm, Simulation, and Application”, Statistics, Optimization & Information Computing, 12(5), pp. 1292-1305. doi: 10.19139/soic-2310-5070-1996.