1) Thoombs BD, Kalisher L: Metastatic disease to the breast; clinical pathologic and radiographic features. Am J Roentgenol 129: 673-676, 1977
2) Nielsen M, Andersen JA, Henriksen FW, et al: Metastases to the breast from extramammary carcinomas. Acta Path Microbiol Scand Sect A 89: 251-256, 1981