Cytokeratin-Supervised Deep Learning for Automatic Recognition of Epithelial Cells in Breast Cancers Stained for ER, PR, and Ki-67. - Mira Valkonen; Jorma Isola; Onni Ylinen; Ville Muhonen; Anna Saxlin; Teemu Tolonen; Matti Nykter; Pekka Ruusuvuori (IEEE Trans. Medical Imaging, 2020)