1. Y Aharonov and D Bohm, Significance of Potentials in Quantum Mechanics, Physical Review, Vol.115, p.485, 1959.
2. A Tonomura, The Quantum World Unveiled by Electron Waves, World Scientific, Singapore, 2000.
3. S Dattagupta, Coherence versus Decoherence, Current Science, Vol.109, p.1951, 2015. For wider discussions see Y Imry, Introduction to Mesoscopic Physics, Oxford University Press, 2nd ed. Oxford, 2002 and S Datta, Transport in Mesoscopic systems, Cambridge University Press, Cambridge, UK, 1995.
4. The exact results for the 3-site ring are based on notes shared by Amnon Aharony, Ora Entin–Wohlman and Shmuel Gurvitz.
5. C Kittel, Introduction to Solid State Physics, 6th edition, John Wiley and Sons, New York, N. Y., 1986.