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Variation of Mumford quotients by torus actions on full
Sbornik. Mathematics, Tome 199 (2008) no. 3, pp. 341-359
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This paper continues the study of the variation of the Mumford quotient by the action of a maximal torus $T$ on a flag variety $G/B$ in terms of its dependence on the projective embedding $G/B\hookrightarrow\mathbb P(V(\chi))$. In the case when $G$ is of type $A_l$, the Picard group of the quotient $(G/B)^{ss}/\!/T$ is calculated under the assumption that the $T$-linearization comes from the standard $G$-linearization. Bibliography : 12 titles. 
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V. S. Zhgoon. Variation of Mumford quotients by torus actions on full. Sbornik. Mathematics, Tome 199 (2008) no. 3, pp. 341-359. http://geodesic.mathdoc.fr/item/SM_2008_199_3_a1/

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