“Endogenous serotonin system does not participate in the withdrawal opiate, but its inhibition by stimulation 5-HT1A receptor increases the effectiveness of the clonidine in rats / El sistema endógeno de serotonina no participa en la abstinencia opiácea..”., HAAJ, vol. 3, no. 1, Jun. 2003, doi: 10.21134/haaj.v3i1.150.