A new method for calculating the energy levels of electrons in solids Zdeněk Matyáš OriginalPaper Pages: 3 - 9
On Sahánek's relation for the generation of short electromagnetic waves in electron tubes Josef Habanec OriginalPaper Pages: 19 - 23
Report on gravimetric measurements carried out at points of the basic gravimetric net-work during 1948 and 1949 on the territory of Czechoslovakia Jan Pícha OriginalPaper Pages: 24 - 26