Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1992). Evidence for B0s meson production in Z0 decays. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 289(1-2), 199-210. https://doi.org/10.1016/0370-2693(92)91385-M (Original work published 1992)