Empirical Studies
Secure Phylogenetic Attachment, Dyadic Trauma, and Completion Across the Life Cycle
Joseph P. Riordan, Abi Blakeslee, and Peter A. Levine

The Somatic Experiencing Trauma Institute has published some interesting research related to Somatic Experiencing.

If you really want to help a traumatised person, you have to work with core physiological states and, then, the mind will start changing.
Bessel van der Kolk, MD