René Martens

http://renemartens.posterous.com/

http://posterous.com/users/4aGafLn7Nm6d#activities/page/1

http://www.amazon.de/-/e/B00455WNCO

https://twitter.com/renemartens

http://www.werkstatt-verlag.de/?q=taxonomy/term/34

http://community.zeit.de/user/ren%C3%A9-martens

http://www.xing.com/profile/Rene_Martens2