Al-Mudamgha, Zainab A., et al. “Alkaline Phosphatase of Cancerous Larynx Tissue in Comparison With the Placental Enzyme: Biochemical and Histochemical Studies”. Acta Oncologica, vol. 36, no. 2, Jan. 1997, pp. 213-8, doi:10.3109/02841869709109232.