Hafeez, Shaista, et al. “Normal Tissue Sparing With Respiratory Adapted Volumetric Modulated Arc Therapy for Distal Oesophageal and Gastro-Oesophageal Tumours”. Acta Oncologica, vol. 53, no. 1, Jan. 2014, pp. 149-54, doi:10.3109/0284186X.2013.776174.