A hyperbolic Kac-Moody Lie algebra in the E-series
Hermann Nicolai, Thomas Fischbacher, Hermann Nicolai, Thomas Fischbacher (arXiv:hep-th/0301017)
H. Mkrtchyan, R. Mkrtchyan, and (arXiv:hep-th/0407148)
Literature discussing in the context of exceptional generalized geometry of 11-dimensional supergravity.
Reviews include
Fabio Riccioni, and M-theory, talk at Strings07 (pdf slides)
Fabio Riccioni, The origin of gauge maximal supergravities (pdf)
Original articles include
Peter West, E(11) and M theory, Class. Quant. Grav., 18:4443–4460, 2001.
Peter West, , ten forms and supergravity, JHEP0603:072,2006 (arXiv:hep-th/0511153)
Fabio Riccioni, Peter West, The origin of all maximal supergravities, JHEP 0707:063,2007 (arXiv:0705.0752)
Fabio Riccioni, Duncan Steele, Peter West, The E(11) origin of all maximal supergravities - the hierarchy of field-strengths, JHEP 0909:095 (2009) (arXiv:0906.1177)
E. Bergshoeff, I. De Baetselier, T. Nutma, E(11) and the Embedding Tensor (arXiv:0705.1304, poster)