Reviews of topical problems

S.I. Vinitskii, V.L. Derbov, V.M. Dubovik, B.L. Markovski, Yu.P. Stepanovskii “Topological phases in quantum mechanics and polarization optics” Sov. Phys. Usp. 33 (6) 403–428 (1990)

S.K. Nemirovskii “Nonlinear acoustics of superfluid helium” Sov. Phys. Usp. 33 (6) 429–452 (1990)

P.A. Golovinskii, I.Yu. Kiyan “Negative ion in a strong optical field” Sov. Phys. Usp. 33 (6) 453–476 (1990)

Methodological notes

B.M. Bolotovskii, V.P. Bykov “Radiation by charges moving faster than light” Sov. Phys. Usp. 33 (6) 477–487 (1990)

Personalia

“Andrei Dmitrievich Sakharov (Obituary)” Sov. Phys. Usp. 33 (6) 488–490 (1990)

Bibliography

A.Yu. Zakharov “Models in statistical physics and quantum field theory” Sov. Phys. Usp. 33 (6) 491–491 (1990)

V.B. Timofeev “Current state of semiconductor silicon technology and material science” Sov. Phys. Usp. 33 (6) 492–493 (1990)