Reviews of topical problems

B.M. Bolotovskii, G.V. Voskresenskii “Emission from charged particles in periodic structures” Sov. Phys. Usp. 11 143–162 (1968)

V.L. Sedov “Annihilation of positrons in metals” Sov. Phys. Usp. 11 163–173 (1968)

A.V. Nedospasov “Striations” Sov. Phys. Usp. 11 174–187 (1968)

L. Pekarek “Ionization waves (striations) in a discharge plasma” Sov. Phys. Usp. 11 188–208 (1968)

V.P. Peshkov “Properties of He³ and of its solutions in He⁴” Sov. Phys. Usp. 11 209–228 (1968)

S.B. Kormer “Optical study of the characteristics of shock-compressed condensed dielectrics” Sov. Phys. Usp. 11 229–254 (1968)

R.N. Gurzhi “Hydrodynamic effects in solids at low temperature” Sov. Phys. Usp. 11 255–270 (1968)

Methodological notes

K.N. Baranskii “Demonstration with conducting gyroscope in a magnetic field” Sov. Phys. Usp. 11 271–272 (1968)

B.N. Esel’son, V.N. Zozulya “Oxygen liquefier for demonstrations” Sov. Phys. Usp. 11 272–273 (1968)

A.N. Kozlova “Certain new demonstrations for the physics course” Sov. Phys. Usp. 11 274–275 (1968)

B.J. Robinson “Influence of motion of the medium on the phase difference between the oscillations of a sound source and a sound receiver” Sov. Phys. Usp. 11 275–275 (1968)

V.A. Trofimov, Yu.V. Rublev “Demonstration of the Malus law” Sov. Phys. Usp. 11 276–276 (1968)

Personalia

A.P. Aleksandrov, L.A. Artsimovich, E.K. Zavoiskii, Yu.M. Kagan “Isaak Konstantinovich Kikoin” Sov. Phys. Usp. 11 277–279 (1968)

B.I. Konstantinov “Feodor Feodorovich Vitman, in memoriam” Sov. Phys. Usp. 11 280–282 (1968)

Letters to the editors

Ya.L. Al’pert “Letter to the Editor” Sov. Phys. Usp. 11 283–283 (1968)