Courtesy of the SPR Facebook page - here's a "peer-reviewed referenced commentary" by Julie Beischel, entitled "Spontaneous, Facilitated, Assisted, and Requested After -Death Communication Experiences and their Impact on Grief," published in Threshold: Journal of Interdisciplinary Consciousness Studies.
http://www.tjics.org/index.php/TJICS/article/view/31/25
http://www.tjics.org/index.php/TJICS/article/view/31/25