1. Vas, J.: Quoted by Frank.18
2. Retropharyngeal Abscess in Adults;Watson;Northwestern Lancet,1903
3. Retropharyngeal Abscess of Otitic Origin;Faier;Ann. Otol., Rhinol. and Laryngol.,1933
4. Case of Recovery After Extensive Exfoliation of the Vertebra Dentata;Syme;Edinburgh Med. Jour.,1826