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https://www.tandfonline.com/doi/full/10.1080/2153599X.2018.1548374
http://www.susanblackmore.uk/wp-content/uploads/2017/05/EJP-1994.pdf
https://psmag.com/social-justice/believe-ghosts-youll-see-ghost-69599
https://www.psychologytoday.com/us/blog/out-the-ooze/201507/why-some-people-see-ghosts-and-other-presences
https://www.tandfonline.com/doi/full/10.1080/2153599X.2018.1548374
https://www.livescience.com/26697-are-ghosts-real.html
https://theconversation.com/the-top-three-scientific-explanations-for-ghost-sightings-58259
https://news.nationalgeographic.com/news/2014/08/140827-quantum-imaging-cats-undetected-photon-science/
https://bigthink.com/philip-perry/large-hadron-collider-disproves-the-existence-of-ghosts-british-professor-claims