TY  - BOOK
AU  - Downs, J. W.
TI  - Practical Conic Sections: The Geometric Properties of Ellipses, Parabolas and Hyperbolas
SN  - 0486428761
PY  - 2003///
CY  - New York
PB  - Dover Publications, Inc.
KW  - Conic Sections
ER  -