@article {Agrachev2017,
	title = {Homotopically invisible singular curves},
	journal = {Calculus of Variations and Partial Differential Equations},
	volume = {56},
	number = {4},
	year = {2017},
	month = {Jul},
	pages = {105},
	issn = {1432-0835},
	doi = {10.1007/s00526-017-1203-z},
	url = {https://doi.org/10.1007/s00526-017-1203-z},
	author = {Andrei A. Agrachev and Francesco Boarotto and Antonio Lerario}
}
@article {boarotto2017homotopy,
	title = {Homotopy properties of horizontal path spaces and a theorem of Serre in subriemannian geometry},
	journal = {Communications in Analysis and Geometry},
	volume = {25},
	number = {2},
	year = {2017},
	pages = {269{\textendash}301},
	publisher = {International Press of Boston},
	doi = {10.4310/CAG.2017.v25.n2.a1},
	author = {Francesco Boarotto and Antonio Lerario}
}
@article {Boarotto2016,
	title = {Conformal Equivalence of 3D Contact Structures on Lie Groups},
	journal = {Journal of Dynamical and Control Systems},
	volume = {22},
	number = {2},
	year = {2016},
	month = {Apr},
	pages = {251{\textendash}283},
	abstract = {<p>In this paper, a conformal classification of three dimensional left-invariant sub-Riemannian contact structures is carried out; in particular, we will prove the following dichotomy: either a structure is locally conformal to the Heisenberg group $mathbbH^3$ or its conformal classification coincides with the metric one. If a structure is locally conformally flat, then its conformal group is locally isomorphic to $SU(2,1)$.</p>},
	issn = {1573-8698},
	doi = {10.1007/s10883-015-9273-8},
	url = {https://doi.org/10.1007/s10883-015-9273-8},
	author = {Francesco Boarotto}
}
