@article{GT_2015_19_3_a11,
     author = {Agrachev, Andrei A and Gentile, Alessandro and Lerario, Antonio},
     title = {Geodesics and horizontal-path spaces in {Carnot} groups},
     journal = {Geometry & topology},
     pages = {1569--1630},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {2015},
     doi = {10.2140/gt.2015.19.1569},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2015.19.1569/}
}