[1]
Z. Bartosiewicz, Ülle Kotta, T. Mullari, M. Tõnso, E. Pawluszewicz, and M. Wyrwas, “Nabla derivatives associated with nonlinear control systems on homogeneous time scales”, NAMC, vol. 21, no. 4, pp. 547–563, Jul. 2016, doi: 10.15388/NA.2016.4.8.