<https://data.wordlift.io/wl89637/post/benefits_of_google_knowledge_graph_and_serps_featured_snippets>
<http://schema.org/sameAs>
<https://www.digitalinformationworld.com/2020/05/knowledge-graph-currently-consists-of-more-than-500-billion-facts-about-5-billion-entities.html>
<https://www.hillwebcreations.com/google-knowledge-graph-and-serps-featured-snippets/>