1. Ahlquist, R. P.: A study of the adrenotropic receptors. Amer. J. Physiol. 153, 586?600 (1948)
2. Manunta, G., Albergoni, V., Pranzetti, P.: Sulla fisiologia dello sfintere del dotto papillare del capezollo di vacca. Arch. vet. ital. 13, 515?522 (1962)
3. Pauerstein, C., Zauder, H.: Autonomic innervation, sex steroids and uterine contractility. Obstet. gynec. Sur. 25, 617?630 (1970)
4. Peeters, G.: Propriétés physiologiques et pharmacologiques du trayon. Arch. int. Pharmacodyn. 77, 100?103 (1948)
5. Peeters, G., De Bruycker, R.: Influence of sympathomimetic drugs on the motility of bovine teat muscles. J. Dairy Res. 42, 11?19 (1975)