Griebel, G., Beeské, S., Jacquet, A., Laufrais, C., Alonso, R., Decobert, M., et al. (2013) Further evidence for the sleep-promoting effects of 5-HT2A receptor antagonists and demonstration of synergistic effects with the hypnotic, zolpidem in rats. Neuropharmacology, 70, 19-26.