RT Journal
T1 The four-dimensional group velocity
A1 Polevoi,V.G.
A1 Rytov,S.M.
PB Uspekhi Fizicheskikh Nauk
PY 1978
FD 10 Jul, 1978
JF Uspekhi Fizicheskikh Nauk
JO Usp. Fiz. Nauk
VO 125
IS 7
SP 549-565
DO 10.3367/UFNr.0125.197807f.0549
LK https://ufn.ru/ru/articles/1978/7/f/