Exposure to radiofrequency electromagnetic fields from mobile networking in motor-carsKoppel, Tarmo; Ahonen, MikkoBulgarian journal of public health = Българско списание за обществено здраве2015 / p. 24-30 : ill http://ncphp.government.bg/files/spisanie/BG_JURNAL_2015_2_1.pdf

Reducing exposure to radiofrequency electromagnetic fields from wireless networking with portable computersKoppel, Tarmo; Vilcane, Inese; Ahonen, MikkoScientific journal of Riga Technical University. Safety of technogenic environment2014 / p. 9-13 : ill