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The latter (shorter) domain is indeed their official website (and is registered to them). The former (longer) domain is owned by Stas Namin Center (which is a reputable organization) but it is not MSO's official website. Hope this helps.—Ëzhiki (Igels Hérissonovich Ïzhakoff-Amursky) • (yo?); December 7, 2015; 14:52 (UTC)
Thank you very much, Ezhiki!!! I have update the logo accordingly. :) Anna Frodesiak (talk) 19:13, 7 December 2015 (UTC)