Mass-Zero constrained dynamics and statistics for the shell model in magnetic field D. D. Girardier, A. Coretti, G. Ciccotti and S. Bonella Eur. Phys. J. B, 94 8 (2021) 158 Published online: 03 August 2021 DOI: 10.1140/epjb/s10051-021-00165-0