The dorsolateral periaqueductal grey N-methyl-D-aspartate/nitric oxide/cyclic guanosine monophosphate pathway modulates the expression of contextual fear conditioning in rats - Aguiar, Daniele C.; Hott, Sara C.; Deolindo, Milena V.; Guimarães, Francisco Silveira; Resstel, Leonardo Barbosa Moraes (Journal of Psychopharmacology, 2014)