algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)
quantum mechanical system, quantum probability
interacting field quantization
A method for constructing Yang-Mills instanton solutions. (ADHM)
The original articles:
Michael Atiyah, Nigel Hitchin, Vladimir Drinfeld, Yuri Manin, Construction of instantons, Physics Letters A 65 3 (1978) 185-187 []
Norman H. Christ, Erick J. Weinberg, and Nancy K. Stanton, General self-dual Yang-Mills solutions, Phys. Rev. D 18 6 (1978) [[doi:10.1103/PhysRevD.18.2013](https://doi.org/10.1103/PhysRevD.18.2013)]
(emphasis on well-separated instanton solutions)
Surveys:
Bert Lindenhovius, Instantons and the ADHM construction, Amsterdam (2011) [pdf]
Nick Dorey, Timothy J. Hollowood, Valentin V. Khoze, Michael P. Mattis, The Calculus of Many Instantons, Phys. Rept. 371 (2002) 231-459 [[arXiv:hep-th/0206063](https://arxiv.org/abs/hep-th/0206063), doi:10.1016/S0370-1573(02)00301-0]
In 8 dimensions:
For the relation to Skyrmions see there.