@article{Deutsch1999QuantumTO,
title={Quantum theory of probability and decisions},
author={D. Deutsch},
journal={Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences},
year={1999},
volume={455},
pages={3129 - 3137}
}

Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences

The probabilistic predictions of quantum theory are conventionally obtained from a special probabilistic axiom. But that is unnecessary because all the practical consequences of such predictions follow from the remaining non–probabilistic axioms of quantum theory, together with the non–probabilistic part of classical decision theory.