Design and development of the optical system for the nanosatellite using RPKoop, Riho; Braziulis, Donatas; Olabode, Olaide Felix; Pecollari, Klevi; Gunasekaran, Balaji; Juurma, Märt; Tamre, Mart; Hiiemaa, MaidoProceedings of the 11th International Conference of DAAAM Baltic Industrial Engineering : 20-22th April 2016, Tallinn, Estonia2016 / p. 31-36 : ill http://innomet.ttu.ee/daaam/

Peirce and the logic of imagePietarinen, Ahti-VeikkoSemiotica2012 / p. 251-261 https://www.researchgate.net/publication/271417244_Peirce_and_the_logic_of_image