Valença, M. M., Andrade-Valença, L. P. A. . and Antunes-Rodrigues, J. . (2011) “Pain and the endogenous antinociceptive neuronal system: physiologic role of oxytocin”, Headache Medicine, 2(4), pp. 182–186. doi: 10.48208/HeadacheMed.2011.26.