Robbert Dijkgraaf, Edward Witten, Topological Gauge Theories and Group Cohomology, Commun. Math. Phys. 129 (1990), 393
Robbert Dijkgraaf, V. Pasquier, P. Roche, QuasiHopf algebras, group cohomology and orbifold models, Nucl. Phys. B Proc. Suppl. 18B (1990), 60-72; Quasi-quantum groups related to orbifold models, Modern quantum field theory (Bombay, 1990), 375–383, World Sci. 1991
On string theory vacua compactified on orbifolds and orientifolds:
On The Unreasonable Effectiveness of Physics in the Mathematical Sciences:
Michael Atiyah, Robbert Dijkgraaf, Nigel Hitchin, Geometry and physics, Phil. Trans. R. Soc. A 13 March 2010 vol. 368 no. 1914 913-926 (pdf, doi;10.1098/rsta.2009.0227)
Robbert Dijkgraaf, The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics, Perimeter Public Lecture 2014 (web, pdf slides).
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