Bundle Gerbes by Peter Bouwknegt, Alan Carey, Varghese Mathai, Michael Murray and Danny Stevenson. Twisted K-theory, old and new External links Strings 2002, Michael Atiyah lecture, "Twisted K-theory and physics" The Verlinde algebra is twisted equivariant K-theory (PDF) Riemann–Roch and index formulae in twisted K-theory (PDF) K-theory