AT ▁IS ... a ▁Project ive ▁Str ucture ?, ▁Notices ▁of ▁the ▁A MS ▁ 5 4 ▁( 1 ) ▁( 2 0 0 7 ), ▁ 3 0 – 3 3 ▁ ▁William ▁Gold man , ▁François ▁Labour ie ▁and ▁Gregory ▁Marg ul is , ▁" Pro per ▁aff ine ▁actions ▁and ▁ge odes ic ▁flows ▁of ▁hyper bol ic ▁surfaces ", ▁Ann . ▁of ▁Math . ▁▁ 1 7 0 ▁( 2 0 0 9 ), ▁ 1 0 5 1 – 1 0 8 3 . ▁ ▁William ▁Gold man , ▁" Loc ally ▁hom ogeneous ▁geometric ▁manif olds ", ▁Pro ceed ings ▁of ▁the ▁ 2 0 1 0 ▁International ▁Congress ▁of ▁Mathemat icians , ▁Hy der abad , ▁India ▁( 2 0 1 0 ), ▁ 7 1 7 – 7 4 4 , ▁H indust an ▁Book ▁Agency , ▁New ▁Del hi , ▁India ▁ ▁William ▁Gold man , ▁" H ig gs ▁bund les ▁and ▁geometric ▁structures ▁on ▁surfaces ", ▁in ▁The ▁Many ▁Fac ets ▁of ▁Ge ometry : ▁a ▁T ribute ▁to ▁N ig el ▁H itch in , ▁O . ▁García - ▁Pr ada , ▁J . P . ▁Bour g ignon , ▁and ▁S . ▁Sal am on ▁( eds .), ▁Oxford ▁University ▁Press ▁( 2 0 1 0 ) ▁ 1 2 9 ▁– ▁ 1 6 3 ▁ ▁Virgin ie ▁Ch aret te , ▁Tod d ▁Dr umm ▁and ▁William ▁Gold man , ▁" Aff ine ▁de form ations ▁of ▁the