@book{Dietmar99,
  author = {Salamon, Dietmar},
  date   = {1999},
  note   = {\url{https://people.math.ethz.ch/~salamon/PREPRINTS/witsei.pdf}},
  title  = {Spin Geometry and Seiberg-Witten Invariants},
}

@article{Mandelbaum1980,
  author       = {Mandelbaum, Richard},
  publisher    = {American Mathematical Society},
  url          = {https://projecteuclid.org:443/euclid.bams/1183545202},
  date         = {1980-01},
  journaltitle = {Bull. Amer. Math. Soc. (N.S.)},
  number       = {1},
  pages        = {1--159},
  title        = {Four-dimensional topology: an introduction},
  volume       = {2},
}

@misc{Calegari,
  author = {Calegari, Danny},
  note   = {\url{https://math.uchicago.edu/~dannyc/courses/4manifolds_2018/4_manifolds_notes.pdf}},
  title  = {Notes on 4-manifolds},
}

@misc{Rudyak,
  author = {Rudyak, Yuli},
  note   = {\url{https://hopf.math.purdue.edu/Rudyak/PLstructures.pdf}},
  title  = {Piecewise Linear Structures on Topological Manifolds},
}

@misc{Matthew,
  author = {Matthew, Akhil},
  note   = {\url{https://math.uchicago.edu/~amathew/dirac.pdf}},
  title  = {The Dirac Operator},
}

@misc{Weston,
  author = {Weston, Tom},
  note   = {\url{https://people.math.umass.edu/~weston/oldpapers/cobord.pdf}},
  title  = {An Introduction to Cobordism Theory},
}