PODOBA, Rudolf - ŠTUBŇA, Igor. Needle electrodes for the measurement of DC and AC conductivity of potato. In PRAE 2011 : proceedings of scientific works 149 s. ISBN 978-80-552-0662-2. . Nitra : Slovak University of Agriculture, 2011, s. 109-112. Dostupné na internete:<http://www.slpk.sk/eldo/2012/zborniky/004-12/Podoba_Stubna.pdf>