Symplectic K2 of Laurent polynomials, associated Kac-Moody groups and Witt rings. Ulf Rehmann; Jun Morita — 1991 Mathematische Zeitschrift
Prescribed Gauss decompositions for Kac-Moody groups over fields Jun Morita; Eugene Plotkin — 2001 Rendiconti del Seminario Matematico della Università di Padova