Aharonov, Yakir; Anandan, Jeeva; Popescu, Sandu; Vaidman, Lev (18 June 1990). "Superpositions of time evolutions of a quantum system and a quantum time-translation machine". Physical Review Letters. 64 (25): 2965–2968. Bibcode:1990PhRvL..64.2965A. doi:10.1103/PhysRevLett.64.2965. PMID10041860.
Aharonov, Yakir; Anandan, Jeeva; Popescu, Sandu; Vaidman, Lev (18 June 1990). "Superpositions of time evolutions of a quantum system and a quantum time-translation machine". Physical Review Letters. 64 (25): 2965–2968. Bibcode:1990PhRvL..64.2965A. doi:10.1103/PhysRevLett.64.2965. PMID10041860.
Aharonov, Yakir; Anandan, Jeeva; Popescu, Sandu; Vaidman, Lev (18 June 1990). "Superpositions of time evolutions of a quantum system and a quantum time-translation machine". Physical Review Letters. 64 (25): 2965–2968. Bibcode:1990PhRvL..64.2965A. doi:10.1103/PhysRevLett.64.2965. PMID10041860.