Sonke, G., Hart, L., Campone, M., Erdkamp, F., Janni, W., Verma, S., Villanueva, C., Jakobsen, E., Alba, E., Wist, E., Favret, A., Bachelot, T., Hegg, R., Wheatley-Price, P., Souami, F., Sutradhar, S., Miller, M., Germa, C., & Burris, H. (n.d.). efficacy and safety of ribociclib (LEE011) + letrozole in elderly patients with hormone receptor-positive (HR+), HER2-negative (HER2−) advanced breast cancer (ABC) in MONALEESA-2. European journal of cancer, 72, S1–S2. http://access.bl.uk/ark:/81055/vdc_100041522033.0x00000b