@article{MAN_1983__263_163734,
     author = {Alex J. Feingold and Igor B. Frenkel},
     title = {A {Hyperbolic} {Kac-Moody} {Algebra} and the {Theory} of {Siegel} {Modular} {Forms} of {Genus} 2.},
     journal = {Mathematische Annalen},
     pages = {87--144},
     publisher = {mathdoc},
     volume = {263},
     year = {1983},
     zbl = {0489.17008},
     url = {http://geodesic.mathdoc.fr/item/MAN_1983__263_163734/}
}