Doepfer

http://www.squidsear.com/cgi-bin/news/newsView.cgi?newsID=713

http://www.gaz-eta.vivo.pl/gaz-eta/recenzje/gazeta.php?nr=65&id=s_1

http://brainwashed.com/index.php? 
option=com_content&task=view&id=6675&Itemid=1

http://emd.pl/wiki/Robert_Piotrowicz_%22Lasting_Clinamen%22

http://www.gaz-eta.vivo.pl/gaz-eta/recenzje/gazeta.php?nr=43&id=s_29

http://brainwashed.com/index.php? 
option=com_content&task=view&id=6090&Itemid=64

http://outerspacegamelan.blogspot.com/2006/11/robert-piotrowicz- 
rurokura-and-final.html