@article{GDZPPN002339102, title = {Generalized Kac-Moody algebras and the modular function j.}, journal = {Mathematische Annalen}, volume = {300}, year = {1994}, pages = {373-384}, zbl = {0787.17022}, url = {http://dml.mathdoc.fr/item/GDZPPN002339102} }
Kang, Seok-Jin. Generalized Kac-Moody algebras and the modular function j.. Mathematische Annalen, Tome 300 (1994) pp. 373-384. http://gdmltest.u-ga.fr/item/GDZPPN002339102/