TY  - BOOK
AU  - Alʹpert, Yakov L. 
TI  - Radio wave propagation and the ionosphere: v. 1 : the Ionosphere
SN  - 0-306-17141-4
PY  - 1973///
CY  - New York
PB  - Consultants Bureau
KW  - Radio-wave PropagationIonosphere
ER  -