Rudoph H. Ehrensing and Gary F. Michell. Similar Antagonism of Morphine Analgesia by MIF-1 and Naloxone in Carassius auratus // Pharmacology Biochemistry and Behavior 17, no. 4 (1981). P. 757–761; Beukema. Acquired Hook-Avoidance, Angling Experiments with Carp.