1. M. Jammer,The Conceptual Development of Quantum Mechanics (McGraw-Hill, New York, 1966), pp. 205, 375–377.
2. Mr. Tait, in a letter to A. Cauchy.(1)
3. W. R. Hamilton,Philos. Mag. 25, 10, 241, 489 (1844).
4. H. Taber,Am. J. Math. 12, 337 (1890).
5. J. W. Gibbs,Nature 44, 79 (1891).