http://psychonaut.i2p/wiki/UserWiki:David_Hedlund
. ↑ Martial, C; Cassol, H; Charland-Verville, V; Pallavicini, C; Sanz, C; Zamberlan, F; Vivot, RM; Erowid, F; Erowid, E; Laureys, S; Greyson, B; Tagliazucchi, E (March 2019). "Neurochemical models of near-death experiences: A large-scale study based on the semantic similarity of written reports". Consciousness and cognition . 69 : 52–69. doi : 10.1016/j.concog.2019.01.011 .