1. Bishop, G. H. The peripheral unit for pain. Journal of Neurophysiology, 1944, 71–80.
2. Brain, R. Presidential address. In C. A. Keele & R. Smith (Eds.), The assessment of pain in man and animals. London: Livingstone, 1962.
3. Burgess, P. R., Petit, D., & Warren, R. M. Receptor types in cat hairy skin supplied for myelinated fibers. Journal of Neurophysiology, 1968, 2Q, 833–848.
4. Burgess, P. R. I Perl, E. R. Cutaneous mechanoreceptors and nociceptors. In A. Iggo (Ed.), Somatosensory system, Vol. II, Handbook of sensory physiology. Berlin: Springer Verlag, 1973.
5. Earle, K. M. The tract of Lissauer and its possible relation to the pain pathway. Journal of Comparative Neurology, 1952, 96, 93–111.