TY  - DATA
AU  - Tabachnikov, Serge.
TI  - Geometry and billiards 
T2  - The Student Mathematical Library, 
SN  - 9781470421410 (online)
PY  - 2005///
CY  - Providence, R.I. :;[s.l.]
PB  - American Mathematical Society ;;Mathematics Advanced Study Semesters
KW  - Billiards
KW  - Calculus of variations
KW  - Geometry
N1  - Includes bibliographical references (p. 167-173) and index
UR  - https://doi.org/10.1090/stml/030
ER  -