Andrew M. Gleason
(1975)., Measures on the closed subspaces of a Hilbert space, in C. A. Hooker (ed.), The logico-algebraic approach to quantum mechanics I, Dordrecht, Springer, pp. 123-133.
(1975)., Measures on the closed subspaces of a Hilbert space, in C. A. Hooker (ed.), The logico-algebraic approach to quantum mechanics I, Dordrecht, Springer, pp. 123-133.