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kovalentne side, mis moodustub orbitaalide kattumisel ühes ruumiosas; see on tugevaim kovalentse sideme tüüp (üksikside on alati sigmaside)
sigmaside . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/sigmaside/1/est (09.07.2026)
