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Caldirola, P. The introduction of the chronon in the electron theory and a charged lepton mass formula (англ.) // Lett. Nuovo Cim.[англ.] : journal. — 1980. — Vol. 27. — P. 225—228. — doi:10.1007/BF02750348.
Caldirola, P. The introduction of the chronon in the electron theory and a charged lepton mass formula (англ.) // Lett. Nuovo Cim.[англ.] : journal. — 1980. — Vol. 27. — P. 225—228. — doi:10.1007/BF02750348.
worldcat.org
Erker, Paul. Autonomous Quantum Clocks : Does Thermodynamics Limit Our Ability to Measure Time? : [англ.] / Paul Erker, Mark T. Mitchison, Ralph Silva … [et al.] // Physical Review X. — 2017. — Vol. 7, no. 3 (2 August). — Art. 031022. — ISSN2160-3308. — arXiv:1609.06704. — doi:10.1103/PhysRevX.7.031022.