[3] INN は難しくない <http://www.ki.nu/software/inn/2.3/>
[4] Install and configure inn <http://configure.sh/FreeBSD/install-soft/inn.html>
[5] INN-2.2.2付属ドキュメント <http://village.infoweb.ne.jp/~fwif0083/mine/lan/news/inn-2.2.2/>
[6] Manpage of readers.conf <http://village.infoweb.ne.jp/~fwif0083/mine/lan/news/inn-2.3.1/readers.conf.5.html>
[7] nnrpd_auth.pl <http://www.horae.dti.ne.jp/~gotoh/dist/nnrpd_auth/nnrpd_auth.pl-v1.1+0.1>