@article{COCV_2021__27_1_A4_0,
     author = {Casas, Eduardo and Tr\"oltzsch, Fredi},
     editor = {Buttazzo, G. and Casas, E. and de Teresa, L. and Glowinski, R. and Leugering, G. and Tr\'elat, E. and Zhang, X.},
     title = {Sparse optimal control for a semilinear heat equation with mixed control-state constraints {\textendash} regularity of {Lagrange} multipliers},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     year = {2021},
     publisher = {EDP-Sciences},
     volume = {27},
     doi = {10.1051/cocv/2020084},
     mrnumber = {4201972},
     language = {en},
     url = {https://www.numdam.org/articles/10.1051/cocv/2020084/}
}