TY  - BOOK
AU  - Ovsienko, Valentin
AU  - Tabachnikov, Serge
TI  - Projective differential geometry old and new : from the Schwarzian derivative to the cohomology of diffeomorphism groups
SN  - 9780521831864
SN  - 200404591
U1  - 516.36 OVS 
PY  - 2005///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Projective differential geometry
N1  - Includes bibliographical references (p. 236-246) and index
ER  -