BROWN, Robert F. and GONÇALVES, Daciberg Lima. Lift factors for the Nielsen root theory on $n$-valued maps. Topological Methods in Nonlinear Analysis. Online. 26 February 2023. Vol. 61, no. 1, pp. 269 - 289. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2022.017.