1. Continuous spinal anesthesia with observations on the first 500 cases;Lemmon;Pennsylvania M. J.,1941
2. Paravertebral anesthesia in obstetrics;Cleland;Surg., Gynec. & Obst.,1933
3. Technique de la ponction du canal sacre pour aborder la voie epidurale. Srs avantages au laboratoire;Cathelin;Compt. rend. Soc. de biol., Paris,1901
4. Quoting from Local Anesthesia;Laewen,1914
5. Caudal anesthesia;Lahmann;Surg., Gynec. & Obst.,1942