1. Electric potential on a tree. A measurement of the sap flow?;Morat;C. R. Acad. Sci. Paris, Sci. Vie,1994
2. Mesure du flux de sève brute dans le tronc du Douglas par une nouvelle méthode thermique;Granier;Ann. Sci. For.,1987
3. Koppán A., Time variation of electrical potential differences in Fagus sylvatica, Diploma work, Sopron University, Sopron, 1996
4. Temporal variation of electrical signal recorded in a standing tree;Koppán;Acta Geod. Geoph. Hung.,1999
5. On the determination of the magnetotelluric impedance tensor;Verõ;Acta Geod. Geoph. Mont. Hung.,1972