TY  - BOOK
AU  - Willoughby,Stephen S.
AU  - Bereiter,Carl
TI  - Math explorations and applications
SN  - 0-02-687855-0
PY  - 1999///
CY  - Columbia, OH
PB  - SRA, McGraw-Hill
KW  - Mathematics
N1  - Index p. 580-583
ER  -