@article{COCV_2022__28_1_A75_0,
     author = {Boarotto, Francesco and Nalon, Luca and Vittone, Davide},
     title = {The {Sard} problem in step 2 and in filiform {Carnot} groups,},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     year = {2022},
     publisher = {EDP-Sciences},
     volume = {28},
     doi = {10.1051/cocv/2022074},
     mrnumber = {4524416},
     zbl = {1515.53026},
     language = {en},
     url = {https://www.numdam.org/articles/10.1051/cocv/2022074/}
}