• Design of passive Bokode markerJuurma, Märt; Ehala, Johannes; Tamre, Mart9th International Symposium "Topical problems in the field of electrical and power engineering". Doctoral school of energy and geotechnology. II : Pärnu, Estonia, June 14-19, 20102010 / p. 131-133 : ill
• IDEE : ID-Balti AS Infoleht2001 https://www.ester.ee/record=b1484764*est