Conditions for obtaining positronium Bose–Einstein condensation in a micron-sized cavityMarcus X. Asaro, Steven Herrera, Melina Fuentes-Garcia, Gabriel G. Cecchini, Erick E. Membreno, Rod G. Greaves and Allen P. MillsEur. Phys. J. D, 76 6 (2022) 107DOI: https://doi.org/10.1140/epjd/s10053-022-00427-1