author = { Kolb, Walter Physikalisch-Technische Bundesanstalt Gruppe Radioaktivität },

title = { Radionuclide concentration in ground level air from 1974 to 1977 in North Germany and North Norway },

publisher = {Physikal.-Techn. Bundesanstalt},

keywords = { Forschungsbericht },

year = {1978},

booktitle = {PTB-Bericht ; Ra, Radioaktivität ; 9},

address = { Braunschweig },

url = { http://slubdd.de/katalog?TN_libero_mab2 }