1. 1. RS Cajal . Histologie du systeme nerveux de l'Homme et des Vertebres . Grand sympathique. Paris, Maloine. 1911 . [2], 891 -942 .
2. Texture of the Nervous System of Man and the Vertebrates
3. 3. RS Cajal, and C Sala . Terminacion de los nervios y tubos glandulares del pancreas de los vertebrados . Trab Lab Hist Fac Med Barc.1891 ; 28 Diciembre: 1 -15 .
4. 4. Berkley . On complex terminations and ganglion cells in the muscular tissue of the heart ventricle . Anat Anz. Bd IX: Quoted in Cajal (1911 ), 1893 .
5. Introduction