Hultborn, A., et al. “Lymphatic Spread of Mammary Carcinoma: Role of Non-Interpectoral Lymph Nodes on Dorsal Surface of Pectoralis Major Muscle and of Interpectoral Nodes”. Acta Oncologica, vol. 10, no. 2, Jan. 1971, pp. 210-4, doi:10.3109/02841867109129757.