Miller, N.E. & Brucker, B.S. (1979). A learned visceral response apparently independent of skeletal ones in patients paralyzed by spinal lesions. In N. Birbaumer & H.D. Kimmel (eds.), Biofeedback and Self-Regulation. Lawrence Erlbaum Associates, pp287-304.
Selye, H. (1936). A syndrome produced by diverse nocuous agents. Nature, 138, 32.