. . "ISBN 978-0-911762-07-5" . "A History of Pi (also titled A History of \u03C0) is a 1970 non-fiction book by Petr Beckmann that presents a layman's introduction to the concept of the mathematical constant pi (\u03C0)."@en . . "99082" . . . "A History of Pi"@en . "190"^^ .