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[[3] Marcus S., Words and languages every-where. Milano: Polimetrica s.a.s., 2007.]Search in Google Scholar
[[4] Paun G., Rosenberg G., A Naturally Unique Scholar: Solomon Marcus – a Man Who Was Never Bored. Annals of the University of Bucharest (mathematical series)6 (LXIV) 2015, 15-–18.]Search in Google Scholar
[[5] Wikipedia entry on Solomon Marcus - https://en.wikipedia.org/wiki/Solomon_Marcus]Search in Google Scholar
[[6] Academician Solomon Marcus web page at the University of Bucharest - http://fmi.unibuc.ro/ro/marcus_solomon]Search in Google Scholar
[[7] Semiosis in communication - web page Phttp://centrucomunicare.ro/semiosis/semiosisc_2016.html Including the special text “Hide and seek”… with Solomon Marcus and Umberto Eco, from IASS-AI Association.]Search in Google Scholar