@article{COCV_2020__26_1_A97_0,
     author = {De Rosa, Luigi and Tione, Riccardo},
     title = {On a question of {D.} {Serre}},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     publisher = {EDP-Sciences},
     volume = {26},
     year = {2020},
     doi = {10.1051/cocv/2020021},
     mrnumber = {4185067},
     zbl = {1460.26010},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv/2020021/}
}