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Some calculations of ray paths in the ionosphere
Forsgren, Sven K.H.
Bok Engelsk 1951
Vertical recording of rain by radar
Sven K.H. Forsgren and Olof F. Perers
Bok Engelsk 1951
Microwave propagation in the optical range
Olof F. Perers, Bo K.E. Stjernberg and Sv...
Bok Engelsk 1951
On the theory of electron wave tubes
Rydbeck, O. E. H.
Bok Engelsk 1951