1. I. Newton: Optics, 4th ed. (Bell and Sons, London 1931)
2. Duc de Chaulines: Memoires de l'Acad. Royale des Sciences (Paris) 136 (1755)
3. T. Young: Phil. Trans. 41 (1802)
4. W. Herschel: Encyclopedia Metropolitana, part. 2, vol. 2 (Baldwing & Crodoch, London 1830) p. 473
5. J. M. Burch: Nature (London) 171, 889 (1953)