“Safety and Effectiveness of Docetaxel Combinated With S-1 for Patients With Incurable Recurrent Squamous Cell Carcinoma of the Head and Neck”. European Journal of Oncology and Environmental Health, vol. 20, no. 3/4, Dec. 2015, pp. 174-9, https://mattioli1885journals.com/index.php/EJOEH/article/view/4294.