1. Armitage, P., Berry, G., 1994. Statistical Methods in Medical Research. Blackwell Science, Oxford.
2. Columnar organization in the midbrain periaqueductal gray and the integration of emotional expression;Bandler;Prog. Brain Res.,1996
3. The location of brainstem neurons which project bilaterally to the spinal trigeminal nuclei as demonstrated by double flourescent retrograde tracer technique;Beitz;Brain Res.,1983
4. Berman, A.L., 1968. The Brain Stem Of The Cat. A Cytoarchitectonic Atlas With Stereotaxic Co-ordinates. University of Wisconsin, London.
5. Besson, J.-M., Fardin, V., Oliveras, J.L., 1991. Analgesia produced by stimulation of the periaqueductal gray matter: true antinociceptive effects versus stress effects. In: Depaulis, A., Bandler, R. (Eds.), The Midbrain Periaqueductal Gray Matter Functional, Anatomical and Neurochemical Organisation. Plenum, New York, pp. 121–138.