TY  - BOOK
AU  - Nikitin, V. F.
AU  - Él'tekov, V. A.
TI  - On some approximate models of geomagnetic field
PY  - 1970///
CY  - [M.]
KW  - Москва
KW  - Д214.21
KW  - rubbk
N2  - Библиогр.: с. 10
ER  -