Variation of geometric invariant theory quotients
Publications Mathématiques de l'IHÉS, Tome 87 (1998), pp. 5-51. 
@article{PMIHES_1998__87__5_0,
     author = {Dolgachev, Igor V. and Hu, Yi},
     title = {Variation of geometric invariant theory quotients},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--51},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {87},
     year = {1998},
     mrnumber = {2000b:14060},
     zbl = {01560390},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1998__87__5_0/}
}
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Dolgachev, Igor V.; Hu, Yi. Variation of geometric invariant theory quotients. Publications Mathématiques de l'IHÉS, Tome 87 (1998), pp. 5-51. http://www.numdam.org/item/PMIHES_1998__87__5_0/

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