Dykes, J. and B.J. Anson. The accessory tendon of the flexor pollicis longus muscle. Zergleiderung eines linken Armes mit Duplicitat des Daumens. Complete absence of the superficial flexors of the thumb and concurrent anomalies. Linburg, R.M. and B.E. Comstock.
Anomalous tendon slips from the flexor pollicis longus to flexor digitorum profundus.
J. Hand Surg. Malhotra, V.K., Singh, N.P. and S.P. Tewari. The accessory head of the flexor pollicis muscle and its nerve supply. Flexor pollicis longus muscle. J. Bone Joint Surg.