1. ENG – https://www.searchenginejournal.com/seo-checklist-website-owners-updated-2016-beyond/163767/
  2. ENG – https://webrunnermedia.com/seo-checklist/
  3. РУС – https://devaka.ru/articles/onpage-seo
  4. Описание функций Frog SEO Spyder – http://seoprofy.ua/blog/optimizaciya-sajtov/kak-sdelat-tech-seo-audit
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