1. C'greig, 1). -M., Ediin. Med. Journ)., Ediniburgli, 1924, XXXI, 560.
2. Lightwood, R. C., & Sheldon, AV. P. H., Archir. Di8. Child., London, 1928, III, 168.
3. 'irchov;Fridolini, J.;Arch('hir., Berliin
4. Ogilvie. A. (l., & Posel, Al. A., ArchiL. )is.Child.. London, 1927, II, 146.
5. Abernethy, l). A., Archir. Dis. Chil(d., London, 1927, II,:361.