A possible solution to Einstein’s problem of 1953: the velocity of a quantum particle in a boxAntonio Feoli, Elmo Benedetto, Luca D’Errico and Antonella Lucia IannellaEur. Phys. J. Plus, 140 1 (2025) 33DOI: https://doi.org/10.1140/epjp/s13360-025-05969-y