1
منشور في: 1951
Superior document: Chalmers Tekniska Högskolas handlingar 103
2
منشور في: 1951
Superior document: Chalmers Tekniska Högskolas handlingar 109
3
منشور في: 1950
Superior document: Ionospheric effects of solar flares preliminary report 2/3.[1949] (1950)
4
Superior document: Chalmers Tekniska Högskolas handlingar ...
5
منشور في: 1949
Superior document: Ionospheric effects of solar flares preliminary report 1.1948 (1949)