https://catalogue-scientifique.canada.ca/record=1528298~S6*frc
Rechercher Beland, Robert R; Rechercher Krause-Polstorff, Juergen; Rechercher Krause-Polstorff, Juergen Walter; Rechercher Polstorff, Juergen Krause
Phillips Laboratory Directorate of Geophysics, Air Force Systems Command, 1991
Publication gouvernementale