TY  - BOOK
AU  - Ferrel,William
TI  - Converging series expressing the ratio between the diameter and the circumference of a circle
T2  - Smithsonian contributions to knowledge. [vol. XVIII, art. 5]
AV  - Q11 .S68
PY  - 1871///]
CY  - [Washington
PB  - Smithsonian Institution
KW  - Mathematics
KW  - Circle
ER  -