I am a member of the debian science team and officially maintain a few packages
I also maintian an unofficial debian server, mainly for the PIPS project. Feel free to add the following lines to your sources.list
deb http://ridee.enstb.org/debian unstable main
deb-src http://ridee.enstb.org/debian unstable main
In order to get rid of the warning concerning unsecure packages, you will need to add my gpg key to you apt keyring
wget http://ridee.enstb.org/debian/pubring.gpg -O - | sudo sh -c "apt-key add -"