Butler, P.J. & Metcalfe, J.D. (1988)
Cardiovascular and Respiratory Systems. In T.J. Shuttleworth (Ed.), Physiology of Elasmobranch Fishes (pp. 1–47). Springer-Verlag Berlin Heidelberg
DOI: 10.1007/978-3-642-73336-9_1

Metcalfe, J.D. & Butler, P.J. (1984)
Changes in activity and ventilation in response to hypoxia in unrestrained, unoperated dogfish (Scyliorhinus canicula L.). Journal of Experimental Biology, 108, 411–418

Butler, P.J. & Taylor, E.W. & Short, S. (1977)
The effect of sectioning cranial nerves V, VII, IXand X on the cardiac response of the dogfish Scyliorhinus canicula to environmental hypoxia. Journal of Experimental Biology, 69(1), 233–245

Butler, P.J. & Taylor, E.W. (1975)
The effect of progressive hypoxia on respiration in the dogfish (Scyliorhinus canicula) at different seasonal temperatures. Journal of Experimental Biology, 63(1), 117–130

Taylor, E.W. & Butler, P.J. (1971)
Some observations on the relationship between heart beat and respiratory movements in the dogfish (Scyliorhinus canicula L.). Comparative Biochemistry and Physiology – Part A, Physiology, 39(2), 297–305
DOI: 10.1016/0300-9629(71)90086-7

Butler, P.J. & Taylor, E.W. (1971)
Response of the dogfish (Scyliorhinus canicula L.) to slowly induced and rapidly induced hypoxia. Comparative Biochemistry and Physiology – Part A, Physiology, 39(2), 307–323
DOI: 10.1016/0300-9629(71)90087-9