1. 2013. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-7437. 2013. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-7437.
2. 2013. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1953. 2013. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1953.
3. 2015. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=779849. 2015. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=779849.
4. 2016. https://gitlab.com/esr/gif2png/issues/1. 2016. https://gitlab.com/esr/gif2png/issues/1.
5. 2016. https://bugs.freedesktop.org/show_bug.cgi?id=85141. 2016. https://bugs.freedesktop.org/show_bug.cgi?id=85141.