D. J. D. Segocio, C. D. Dayanghirang, and J. E. Cachuela, “A 15-Year Occult Foreign Body in the Subglottic Area of A 50-Year-Old Woman”, Philipp J Otolaryngol Head Neck Surg, vol. 31, no. 2, pp. 47–50, Nov. 2016.