\input zb-basic
\input zb-ioport
\iteman{io-port 05441859}
\itemau{Ito, Shinya; Tsubokawa, Hiroshi}
\itemti{A method of digital watermarking by using the frequency masking effect.}
\itemso{Syst. Comput. Jpn. 37, No. 11, 79-87 (2006).}
\itemcc{}
\itemut{}
\itemli{doi:10.1002/scj.10490}
\end