Stimulation-produced analgesia from the occipital or retrosplenial cortex of rats involves serotonergic and opioid mechanisms in the anterior pretectal nucleus - Reis, Gláucia de Melo; Rossaneis, Ana Carolina; Silveira, João Walter de Souza da; Dias, Quintino Moura; Prado, Wiliam Alves do (The Journal of Pain, 2011)