Trigeminal fibre collaterals storing substance P and calcitonin gene-related peptide associate with ganglion cells containing choline acetyl-transferase and vasoactive intestinal polypeptide in the sphenopalatine ganglion of the rat. An axon reflex modulating parasympathetic ganglion activity? - Suzuki,N.; Hardebo,J.E.; Owman,C. (Neuroscience, 1989)