The famous article of V. Ambarzumian and D. Iwanenko in 1930

The famous article: Ambarzumian V., Iwanenko D., "Les électrons inobservables et les rayons", Compt. Rend. Acad Sci. Paris, 190, (1930) 582-584,  on creation and annihilation of massive particles now is available
http://www.g-sardanashvily.ru/Amb-Iv.pdf

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