@article{MZ_1991__206_1_174206,
     author = {Ulf Rehmann and Jun Morita},
     title = {Symplectic {K2} of {Laurent} polynomials, associated {Kac-Moody} groups and {Witt} rings.},
     journal = {Mathematische Zeitschrift},
     pages = {57--66},
     publisher = {mathdoc},
     volume = {206},
     number = {1},
     year = {1991},
     zbl = {0728.19001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174206/}
}