• Electromagnetic shielding properties of ceramic spheres coated with paramagnetic metalKoppel, Tarmo; Shiskin, A.; Hussainova, Irina; Haldre, Heldur; Tint, PiiaAgronomy research2016 / p. 1015-1022 : ill http://ise.elnet.ee/record=b2891940~S1*est https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-84970007017&origin=inward&txGid=a7b9f87dda6c19cbce15cfa2ebd33f2b
• Intermediate and low radiofrequency electromagnetic field transmission properties in case of common building materials [Online resource]Koppel, Tarmo; Shishkin, Andrei; Toropovs, Nikolajs; Haldre, Heldur; Hussainova, Irina; Mironovs, Viktors; Tint, Piia2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) : October 13, 14, 2016 : conference proceedings2016 / [6] p. : ill https://doi.org/10.1109/RTUCON.2016.7763144
• Microwave reflectance and transmittance properties of conductive composite materialsShishkin, Andrei; Koppel, Tarmo; Mironov, Viktor; Hussainova, Irina; Locs, Janis; Haldre, HeldurEnergy procedia2017 / p. 354-361 : ill https://doi.org/10.1016/j.egypro.2017.04.006 https://www.scopus.com/sourceid/17700156736 https://www.scopus.com/record/display.uri?eid=2-s2.0-85020703294&origin=inward&txGid=d209f459c348a8e220fc94faad50c4db https://www.webofscience.com/wos/woscc/full-record/WOS:000416786300052
• 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
• Natural electrostatic field of the Earth - an example of double grass circleKoppel, Tarmo; Haldre, HeldurEarth's Fields and Their Influence on Organisms : International Conference at Birštonas, June 15-18, 2017 : abstracts and materials2017 / p. 89-93
• Radiowaves' standing waves could be mistakenly interpreted as Hartman linesKoppel, Tarmo; Haldre, HeldurEarth's Fields and Their Influence on Organisms : International Conference at Birštonas, June 15-18, 2017 : abstracts and materials2017 / p. 54-60
• Reflection and transmission properties of common construction materials at 2.4 GHz frequencyKoppel, Tarmo; Shishkin, Andrei; Haldre, Heldur; Toropovs, Nikolajs; Vilcane, Inese; Tint, PiiaEnergy procedia2017 / p. 158-165 https://doi.org/10.1016/j.egypro.2017.04.045 https://www.scopus.com/sourceid/17700156736 https://www.scopus.com/record/display.uri?eid=2-s2.0-85020705025&origin=inward&txGid=91b874ceb83a04fab702e29b7a24394e https://www.webofscience.com/wos/woscc/full-record/WOS:000416786300024
• 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
• Spatial distribution of the Earth's magnetic field in the nature - example measurements at Elva reservoirKoppel, Tarmo; Haldre, Heldur; Priiman, R.Earth's Fields and Their Influence on Organisms : International Conference at Birštonas, June 15-18, 2017 : abstracts and materials2017 / p. 61-65
• The interaction of electrostatic fields in humans and their work environment [Electronic resource]Koppel, Tarmo; Haldre, Heldur; Kaev, Kristjan JoanDoctoral Summer School 2012 : doctoral school in economics and innovation : 24-27 July 2012, Nelijärve, Estonia2012 / 16 p. : ill [CD-ROM]