\input zb-basic
\input zb-ioport
\iteman{io-port 70706310}
\itemau{Coppersmith, Don}
\itemti{Weakness in quaternion signatures}
\itemso{CRYPTO, 305-314 (1999).}
\itemcc{}
\itemut{}
\itemli{doi:10.1007/3-540-48405-1\_19}
\end