Title of Publication :Evaluation of Atmospheric Electric Field as Increasing
Publication type:Article in High-rating International Journal
Journal/Publisher :Thales, in honor of Prof. Emeritus Michael E. Contadakis, ISBN 978-960-89704-1-0, 2013, p 213-225,
http://adsabs.harvard.edu/abs/2013thmc.book..213K,
http://www.topo.auth.gr/greek/ORG_DOMI/EMERITUS/TOMOS_CONTADAKIS/Thales_pdf/2.07_Kachakhidze.pdf