RECABARREN, S., ALBORNOZ, R., ESPINOZA, M. and LOBOS, A. (1997) “Effect of naltrexone on the secretion pattern of the luteinizing hormone in prepubertal ewes”, Archivos de Medicina Veterinaria, 29(1), pp. 55–61. doi: 10.4067/S0301-732X1997000100006.