TY  - BOOK
AU  - Gutenmacher, Victor.
AU  - Vasilyev, N.B.
TI  - Lines and curves: : A practical geometry handbook
SN  - 0817641610
U1  - 516.0076 
PY  - 2004///
CY  - New York: 
PB  - Birkhauser Boston Inc., 
KW  - Level curves
KW  - Logical combinations
KW  - Math
KW  - School geometry
ER  -