TY  - BOOK
AU  - FERRERS (N M)
TI  - Elementary treatise on trilinear co-ordinates
U1  - 514/25 
PY  - 1861///
CY  - London
PB  - Macmillan & Co. Ltd.
KW  - trilinear
KW  - treatise
KW  - on
KW  - Elementary
KW  - co-ordinates
ER  -