https://git-scm.com/
https://subversion.apache.org/
https://www.mercurial-scm.org/
https://www.atlassian.com/blog/software-teams/version-control-centralized-dvcs
http://www.wikizeroo.net/wiki/en/Distributed_version_control
http://www.wikizeroo.net/index.php?q=aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvTGlzdF9vZl92ZXJzaW9uX2NvbnRyb2xfc29mdHdhcmU
