TY - JOUR AU - Yu. L. Sachkov AU - E. F. Sachkova TI - The structure of abnormal extremals in a sub-Riemannian problem with growth vector $(2, 3, 5, 8)$ JO - Sbornik. Mathematics PY - 2020 SP - 1460 EP - 1485 VL - 211 IS - 10 UR - http://geodesic.mathdoc.fr/item/SM_2020_211_10_a4/ LA - en ID - SM_2020_211_10_a4 ER -