Discrete and continuum phenotype-structured models for the evolution of cancer cell populations under chemotherapyRebecca E.A. Stace, Thomas Stiehl, Mark A.J. Chaplain, Anna Marciniak-Czochra and Tommaso LorenziMath. Model. Nat. Phenom., 15 (2020) 14DOI: https://doi.org/10.1051/mmnp/2019027