Biases in the estimation of velocity dispersions and dynamical masses for galaxy clustersA. Ferragamo, J.A. Rubiño-Martín, J. Betancort-Rijo, E. Munari, B. Sartoris and R. BarrenaEPJ Web Conf., 228 (2020) 00011DOI: https://doi.org/10.1051/epjconf/202022800011