SEMrush research unveiled at SMX Advanced suggests the key to voice performance is high SERP placement, site speed, content readability and high-quality backlinks.
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Original source: http://feeds.searchengineland.com/~r/searchengineland/~3/JJ5vEuI2_KY/experts-tout-voice-search-as-study-ties-answers-to-top-3-organic-results-317964