HA, Ku Yong and LEE, Jong Bum. The Nielsen type numbers for maps on a 3-dimensional flat Riemannian manifold. Topological Methods in Nonlinear Analysis. Online. 1 June 2015. Vol. 45, no. 2, pp. 327 - 362. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2015.017.