I am interested in an old physics paper by Viktor Ambartsumyan and Dmitrii Ivanenko: Doklady Akademii Nauk SSSR, ser. A, No. 6, p.153 (1930). It concerns the structure of the atomic nucleus and accurately predicted the neutron's existence. I have been unable to locate it online.
Original article in German - W.A. Ambarzumjan, D.D. Iwanenko – Uber eine Folgerung der Diracschen Theorie der Protonen und Elektronen (On a Consequence of the Dirac Theory of Protons and Electrons) // Доклады Академии Наук СССР, сер. А (Doklady USSR Acad. Sci., Ser. A), Vol. 6, p. 153-155, 1930
Is it one of these? What's the title of the paper? I guess it could be the third one. I have no idea what the title means.
(If you need it translated, get the Google Chrome browser.) The papers are in English.
***Edit: Nevermind, these papers aren't relevant.