1. K. von Meyenn, Scientific Correspondence with Bohr, Einstein, Heisenberg, edited by W. Pauli (Springer-Verlag, Berlin, 1930), Vol. II, p. 15;
2. Scientific Correspondence with Bohr, Einstein, Heisenberg, edited by W. Pauli (Springer-Verlag, Berlin, 1946), Vol. III, p. 380.
3. Quantized Space-Time
4. Quantum field theory on noncommutative spaces
5. Physical instances of noncommuting coordinates