Frequency spectra for admittance and voltage transfers measured on a three-phase power transformer / by M.H.J. Bollen and P.T.M. VaessenExtensive testing of an algorithm for travelling-wave-based directional detection and phase-selection by using TWONFIL and EMTP / by M.H.J. Bollen and G.A.P. JacobsImplementation of an algorithm for travelling-wave-based directional detection / by M.H.J. Bollen and G.A.P. JacobsOn travelling-wave-based protection of high-voltage networks / Mathias Henricus Johannes BollenOn insular power systems : drawing up an inventory of phenomena and research possibilities / by M.H.J. Bollen, M.A. van HoutenLiterature search for reliability data of components in electric distribution networks / by M.H.J. BollenIonosferische Dopplereffecten tijdens de inzet van een geomagnetische storm / Math. Bollen