TY  - BOOK
AU  - Beckmann, Petr.
TI  - History of PI (π)
SN  - 0312381859
U1  - 512​.924 
PY  - 1971///
CY  - New York
PB  -  St. Martin's Press
KW  - Pi
KW  - Mathematics
KW  - Number Theory
N1  - Bibliography details including index
ER  -