Mohammadzadeh A., Haghighi M., Naderi B., Chaudhry A., Hussain Khan Z., Rasouli M. R., and Saadat S. “Comparison of Two Different Methods of Fiber-Optic Nasal Intubation: Conventional Method Versus Facilitated Method (NASAL-18)”. Upsala Journal of Medical Sciences, vol. 116, no. 2, Feb. 2011, pp. 138–141, doi:10.3109/03009734.2010.534827.