%0 Journal Article %A Colli, Pierluigi %A Signori, Andrea %A Sprekels, Jürgen %T Second-order analysis of an optimal control problem in a phase field tumor growth model with singular potentials and chemotaxis %J ESAIM: Control, Optimisation and Calculus of Variations %D 2021 %V 27 %I EDP-Sciences %U https://www.numdam.org/articles/10.1051/cocv/2021072/ %R 10.1051/cocv/2021072 %G en %F COCV_2021__27_1_A75_0