2J. R. Clements,J. E. Madl,R. L. Johnson,A. A. Larson,A. J. Beitz. Localization of glutamate, glutaminase, aspartate and aspartate aminotransferase in the rat midbrain periaqueductal gray[J] 1987,Experimental Brain Research(3):594～602
3M. Gioia,G. Tredici,R. Bianchi. A golgi study of the periaqueductal gray matter in the cat. Neuronal types and their distribution[J] 1985,Experimental Brain Research(2):318～332
