@article{SM_2020_211_10_a4,
     author = {Yu. L. Sachkov and E. F. Sachkova},
     title = {The structure of abnormal extremals in {a~sub-Riemannian} problem with growth vector $(2, 3, 5, 8)$},
     journal = {Sbornik. Mathematics},
     pages = {1460--1485},
     year = {2020},
     volume = {211},
     number = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_10_a4/}
}