Geodesic
Stabilization theorem for the Milnor $K_2$-functor
Zapiski Nauchnykh Seminarov POMI, Rings and modules, Tome 64 (1976), pp. 131-152 
A. A. Suslin; M. S. Tulenbaev. Stabilization theorem for the Milnor $K_2$-functor. Zapiski Nauchnykh Seminarov POMI, Rings and modules, Tome 64 (1976), pp. 131-152. http://geodesic.mathdoc.fr/item/ZNSL_1976_64_a12/
@article{ZNSL_1976_64_a12,
     author = {A. A. Suslin and M. S. Tulenbaev},
     title = {Stabilization theorem for the {Milnor} $K_2$-functor},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {131--152},
     year = {1976},
     volume = {64},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_64_a12/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Let $\Lambda$ be an associative ring. For every natural number $n$ there is a canonical homomorphism $\Psi_n\colon K_{2,n}(\Lambda)\to K_2(\lambda)$ where $K_2$ is the Milnor functor and $K_{2,n}(\lambda)$ the associated unstable $K$-group. Dennis and Vasershtein have proved that if $n$ is larger than the stable rank of $\Lambda$, $\Psi_n$is an epimorphism. It is proved in the article that if $n-1$ is greater than the stable rank of $\Lambda$, the homomorphism $\Psi_n$ is an isomorphism.