found: Britannica online, July 18, 2012(under cobalt (Co): In its compounds cobalt nearly always exhibits a +2 or +3 oxidation state, although states of +4, +1, 0, and -1 are known. The compounds in which cobalt exhibits the +2 oxidation state (Co2+, the ion being stable in water) are called cobaltous, while those in which cobalt exhibits the +3 oxidation state (Co3+) are termed cobaltic.)
found: The Smithsonian/NASA Astrophysics Data System search, via WWW, July 18, 2012(cobalt compounds; cobaltous compounds)
found: Lexic.us website, July 18, 2012(cobaltic: Pertaining to, derived from, or containing, cobalt; -- said especially of those compounds in which cobalt has higher valence; as, cobaltic oxide; cobaltous: Pertaining to, derived from, or containing, cobalt; -- said esp. of cobalt compounds in which the metal has its lower valence.)
