Main bird excrement contamination type causing insulator flashovers in 110 kV overhead power lines in EstoniaTaklaja, Paul; Oidram, Rein; Niitsoo, Jaan; Palu, IvoOil shale2013 / p. 211-224 : ill https://artiklid.elnet.ee/record=b2631738*est

Wet test on naturally polluted glass and composite insulatorsTaklaja, Paul; Niitsoo, Jaan; Palu, IvoPQ2012 : 8th International Conference : 2012 Electric Power Quality and Supply Reliability : June 11-13, 2012, Tartu, Estonia : conference proceedings2012 / p. 261-266 : ill https://ieeexplore.ieee.org/document/6256236