Geodesic
Tangent space to Milnor $K$-groups of rings
Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 34-42.

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We prove that the tangent space to the $(n+1)$th Milnor $K$-group of a ring $R$ is isomorphic to the group of $n$th absolute Kähler differentials of $R$ when the ring $R$ contains $1/2$ and has sufficiently many invertible elements. More precisely, the latter condition means that $R$ is weakly $5$-fold stable in the sense of Morrow. 
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S. O. Gorchinskiy; D. V. Osipov. Tangent space to Milnor $K$-groups of rings. Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 34-42. http://geodesic.mathdoc.fr/item/TRSPY_2015_290_a2/

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