Reviews of topical problems

V.L. Ginzburg, V.S. Ptuskin “On the origin of cosmic rays: Some problems in highenergy astrophysics” 18 931–959 (1975)

V.I. Ogievetskii, L. Mezincescu “Boson-fermion symmetries and superfields” 18 960–982 (1975)

New measurement instruments and methods

A.L. Suvorov “The quasi-chromaticity method in field-ion microscopy” 18 983–987 (1975)

Methodological notes

I.G. Kaplan “The exclusion principle and indistinguishability of identical particles in quantum mechanics” 18 988–994 (1975)

Personalia

S.V. Vonsovskii, P.L. Kapitza, I.K. Kikoin, M.N. Mikheev, N.N. Semenov, Ya.S. Shur “Yakov Grigor’evich Dorfman (obituary)” 18 995–999 (1975)