Mikhail Shifman (1995). "ITEP Lectures in Particle Physics". arXiv:hep-ph/9510397. Cite error: The named reference "ellis" was defined multiple times with different content (see the help page).
Vainshtein, A. I.; Zakharov, V. I.; Shifman, M. A. (1975). "A possible mechanism for the ΔT = 1/2 rule in nonleptonic decays of strange particles". Pisma Zh. Eksp. Teor. Fiz.22: 123. Bibcode:1975ZhPmR..22..123V.
Translated in Vainshtein, A. I.; Zakharov, V. I.; Shifman, M. A. (1975). "A possible mechanism for the ΔT = 1/2 rule in nonleptonic decays of strange particles". JETP Letters. 22: 55. Bibcode:1975JETPL..22...55V.