1. Band, D.:Edin. Med. Jo., 1935, xlii, 162.
2. Barney, J. D.: “Modern Urology.” (Cabot.) 3rd edit. London, 1936.
3. Baumgarten:Arch. f. klin. Chir., 1901, lxiii, 1019.
4. Belfield, W. T.:Jo. Amer. Med. Assoc., 1905, xliv, 1277.
5. ibid., 1913, lxi, 1867.