Ésik, O, W Schlegel, J Doll, G. Németh, and W. J. Lorenz. 1989. “Three-Dimensional Photon Radiotherapy Planning for Laryngeal and Hypopharyngeal Tumours”. Acta Oncologica 29 (4):439-46. https://doi.org/10.3109/02841869009090027.