Gemmell H G, Sharp P F, Smith F W, Besson J A, Ebmeier K P, Davidson J, Evans N T, Roeda D, Newton R, Mallard J R
Department of Bio-Medical Physics, University of Aberdeen, Scotland.
Psychiatry Res. 1989 Sep;29(3):327-9. doi: 10.1016/0165-1781(89)90079-6.