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