Computing simplicial representatives of homotopy group elements
M. Filakovský, P. Franek, U. Wagner, S.Y. Zhechev, Journal of Applied and Computational Topology 2 (2018) 177–231.

On computability and triviality of well groups
P. Franek, M. Krcál, Discrete &; Computational Geometry 56 (2016) 126–164.