アレックス・エスキン
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Alex Eskin; David Fisher; Kevin Whyte (2012). “Coarse differentiation of quasi-isometries I: Spaces not quasi-isometric to Cayley graphs.”. Annals of Mathematics 176 (1): 221–260. doi:10.4007/annals.2012.176.1.3. http://annals.math.princeton.edu/wp-content/uploads/annals-v176-n1-p03-p.pdf.