1. Tamm I, Belenky S (1939) On the soft component of cosmic rays at sea level. J Phys USSR 1:177
2. Ivanenko IP (1956) Cascade showers produced by electrons and photons in light and heavy elements. Zh Exper Teor Fiz 31:86–104 (in Russian)
3. Ivanenko IP, Syzov VV (1988) Moments of longitudinal distributions of electron-photon cascades. Moscow State University Bulletion, ser 3, Fizika. Astronomia 29(2):21–25 (in Russian)
4. Ivanenko IP, Syzov VV (1988) Calculation of longitudinal distributions of electron-photon cascades by moment method, ibid, pp 22–28 (in Russian)
5. Ivanenko IP, Syzov VV (1988) On the accuracy of angular distribution moments in electron-photon cascades, ibid, pp 28–33 (1988) (in Russian)