Dark fluid - Wikipedia
http://en.wikipedia.org/wiki/Dark_fluid
Dark Fluid: Dark Matter And Dark Energy May Be Two Faces Of Same Coin
http://www.sciencedaily.com/releases/2008/01/080131094056.htm
Dark matter gets an even bigger question mark | CosmOnline
http://www.cosmonline.co.uk/blog/2010/06/22/dark-matter-gets-even-bigger-question-mark
What is the theory of dark fluid? - by Ray Burke - Helium
http://www.helium.com/items/1872271-what-is-the-theory-of-dark-fluid