1. Untersuchung geophysikalischer Parameter in Zusammenhang mit Erdbeben in Kärnten und Friaul;Aric;Zentralanst Meteorol. Geodyn., Vienna Publ.,1980
2. Bolu Sicak Su Kaynaklarinin Hidrojeolojik Incelenmesi;Canik;Selcuk Univ. Fen Fak. Yayin., Konya,1980
3. A portable continuously working radon measuring system;Friedmann;Rad. Prot. Dosimetry,1984
4. Anomalies in the radon content of spring water as earthquake precursor phenomena;Friedmann;Earthquake Prediction Res.,1985
5. A theoretical model for the change of shape of springwater radon anomalies with epicentral distance;Friedmann;Pure Appl. Geophys.,1985