Malmström, Annika, et al. “Gemcitabine and Capecitabine in Combination for Advanced Anthracycline and Taxane Pre-Treated Breast Cancer Patients: A Phase II Study”. Acta Oncologica, vol. 49, no. 1, Jan. 2010, pp. 35-41, doi:10.3109/02841860903268031.