1. Derivation of the energy-time uncertainty relation
2. Time in the Quantum Theory and the Uncertainty Relation for Time and Energy
3. W. Pauli,Die Allgemeinen Prinzipien der Wellenmechanik, Encyclopedia of Physics, edited by S. Flügge (Springer-Verlag, Berlin, 1958), Vol. V, Part 1, pp. 1–168. See footnote 1 on p. 60.
4. Free-motion time-of-arrival operator and probability distribution
5. N. I. Akhiezer and I. M. Glazman,Theory of Linear Operators in Hilbert Space(Pitman Advanced Publishing Program, Boston, 1981), Vol. I, Chap. 4, Sec. 55.