1. M. Alexandrov, M. Kontsevich, A. Schwarz and O. Zaboronsky, The Geometry of the Master Equation and Topological Quantum Field Theory, [http: //arxiv. org/refs/hep-th/0608150]
2. A. Asada, Characteristic classes of loop group bundles and generalized string classes, Differential geometry and its applications (Eger, 1989), 33–66, Colloq. Math. Soc. János Bolyai, 56, North-Holland, Amsterdam, (1992)
3. P. Aschieri and B. Jurco, Gerbes, M5-brane anomalies and E 8 gauge theory J. High Energy Phys. 0410 (2004) 068, [arXiv:hep-th/0409200v1].
4. R. D’Auria and P. Fré, Geometric supergravity in D = 11 and its hidden supergroup, Nuclear Physics B, 201 (1982)
5. J. Baez and A. Crans, Higher-dimensional algebra VI: Lie 2-algebras, Theory and Applications of Categories 12 (2004) 492–528, [arXiv:math/0307263v5].