von Neumann’s theorem and hidden-variable models

The Impossible Causality: The No Hidden Variables Theorem of John von Neumann

Von Neumann’s ‘No Hidden Variables’ Proof: A Re-Appraisal

Von Neumann's Informal Hidden-Variable Argument

On the Validity of von Neumann’s Theorem

The Stone–von Neumann Theorem

Von Neumann’s Theorem on the Impossibility of Introducing Hidden Parameters in Quantum Mechanics