TY  - BOOK
AU  - Avaste, O. A.
AU  - Villmann, Pš.
ED  - International union of geodesy and geophysics
TI  - On the method of determination of the optical depths of noctilucent clouds
PY  - 1971///
CY  - Мoscow
KW  - Гф3-448
KW  - rubbk
N2  - Библиогр.: с. 19-20
ER  -