Applying Peirce in Tallinn and HelsinkiPietarinen, Ahti-VeikkoSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2014 / p. 417-420 http://dx.doi.org/10.12697/SSS.2014.42.2-3.13 http://www.ester.ee/record=b1331700*est

Exploring Peirce's speculative grammar : the immediate object of a signBellucci, FrancescoSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2015 / p. 399-418 http://dx.doi.org/10.12697/SSS.2015.43.4.02 http://www.ester.ee/record=b1331700*est

Is Euler's circle a symbol or an icon?Moktefi, AmiroucheSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2015 / p. 597-615 : ill http://dx.doi.org/10.12697/SSS.2015.43.4.14 http://www.ester.ee/record=b1331700*est

Recent studies on signs : commentary and perspectivesPietarinen, Ahti-VeikkoSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2015 / p. 616-650 http://dx.doi.org/10.12697/SSS.2015.43.4.15 http://www.ester.ee/record=b1331700*est

Sign theory at work : the mental imagery debate revisitedIssajeva, JelenaSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2015 / p. 584-596 : ill http://dx.doi.org/10.12697/SSS.2015.43.4.13 http://www.ester.ee/record=b1331700*est

Signs systematically studied : invitation to Peirce's theoryPietarinen, Ahti-VeikkoSign systems studies = Töid märgisüsteemide alalt = Труды по знаковым системам2015 / p. 372-398 http://dx.doi.org/10.12697/SSS.2015.43.4.01 http://www.ester.ee/record=b4554246*est