Dr Carlos Alvarado has published a blog post gathering references to recent articles on mediumship. One of these is a paper by Dr Alan Gauld in the Journal of the Society for Psychical Research, 'Two cases from the lost years of Mrs Piper'.
The blog can be found here:
https://carlossalvarado.wordpress.com/2016/11/25/recently-published-articles-about-mediumship/