Brody, D C and Hughston, L P. 1998. Geometric Models for Quantum Statistical Inference. In: S A Huggett; L J Mason; K P Tod and S T Tsou, eds. The Geometric Universe: Science, Geometry, and the Work of Roger Penrose. Oxford: Oxford University Press, pp. 265-276. ISBN 0198500599 [Book Section]

Hughston, L P. 1995. Geometric Aspects of Quantum Mechanics. In: S A Huggett, ed. Twistor Theory. Marcel Dekker, pp. 59-79. [Book Section]