[MathOuvrage]
Groups of circle diffeomorphisms
/ Navas, Andrès.
-Chicago IL : University of Chicago press, 2012. - xviii, 290 p. ; 24 cm
ISBN 9780226569512
[MathOuvrage]
Projective differential geometry old and new
/ Ovsienko, Valentin ; Tabachnikov, Serge.
-Cambridge : Cambridge university Press, 2004. - xi, 249 p. ; 24 cm
ISBN 9780521831864