Valuations on Functionally Closed Sets of Quantum Mechanical Observables   and Von Neumann's 'No-Hidden-Variables' Theorem
  We apply the machinery of projection lattices and von Neumann algebras to analyze the question of how modal interpretations can (and do) circumvent von Neumann's infamous 'no-hidden-variables' theorem. 
Jason Zimba (Dept. of Physics, UC Berkeley) and Rob Clifton (Dept. of   Philosophy, Univ. of Pittsburgh)