On Coulomb branch singularities in D=3 N=4 super Yang-Mills theory:
Mathew Bullimore, Tudor Dimofte, Davide Gaiotto, The Coulomb Branch of 3d $\mathcal{N}=4$ Theories, Commun. Math. Phys. (2017) 354: 671 (arXiv:1503.04817)
(relation to Nahm's equations and the moduli space of monopoles)
Discussion of topological quantum field theory with an eye towards supersymmetric field theory, in terms of the ordinary homology of configuration spaces of points (see also at correlators as differential forms on configuration spaces of points):
On the Witten index of D=3 N=4 super Yang-Mills theory:
On the Witten index for D=3 N=2 super Yang-Mills theory: