1. Symptoms and diagnosis of extradural cysts;Elsberg;Bull. Neurol. Inst. New York,1934
2. Spinal extradural cyst and kyphosis dorsalis juvenilis;Cloward;Am. J. Roentgenol.,1937
3. Kyphosis dorsalis juvenilis;Scheuermann;Ztschr. f. Orthop. Chir.,1921