• Exposure to radiofrequency electromagnetic fields from mobile networking in motor-cars [Electronic resource]Koppel, Tarmo; Ahonen, MikkoThe 8th International Workshop on Biological Effects of Electromagnetic Fields : papers2014 / [CD-ROM]
• Labelled marker dataset from Smith chart for image processing based intelligent tuning of microwave cavity filtersSekhri, EvenIEEE DataPort2023 / 1 p. https://doi.org/10.21227/zfd8-xt50
• Microwave reflection and absorption properties of wet snowKoppel, Tarmo; Haldre, Heldur; Shishkin, AndreiRiga Technical University 57th International Scientific Conference : "Scientific Conference on Economics and Entrepreneurship" (SCEE'2016) : proceedings2016 / p. 170-171 : ill
• Microwave reflection properties of building materials in the working environmentKoppel, Tarmo; Haldre, Heldur56th International Riga Technical University Conference "Scientific Conference on Economics and Entrepreneurship SCEE'2015" : proceedings2015 / p. 148-150 : tab
• Salt water sprayed paper microwave attenuation in shielding workplacesKoppel, Tarmo; Shishkin, Andrei; Haldre, HeldurRiga Technical University 57th International Scientific Conference : "Scientific Conference on Economics and Entrepreneurship" (SCEE'2016) : proceedings2016 / p. 172-173 : ill
• Shielding inbound microwave electromagnetic radiationKoppel, Tarmo; Haldre, Heldur56th International Riga Technical University Conference "Scientific Conference on Economics and Entrepreneurship SCEE'2015" : proceedings2015 / p. 151-153 : tab