Bertfried FauserGuillaume RaynaudSteven VickersThe Born rule as structure of spectral bundles (extended abstract).QPL201181-90journals/corr/abs-1210-0298https://doi.org/10.4204/EPTCS.95.8https://doi.org/10.48550/arXiv.1210.0615db/series/eptcs/eptcs95.html#abs-1210-0615