The biology, distribution and conservation status of cold-water corals are discussed in detail in a recent United Nations Environment Programme report "Cold-water Coral Reefs: Out of Sight - No Longer Out of Mind".
The Hexacorallians of the World website is a compliation of publications concerning taxonomy, nomenclature and geographic distribution of extant hexacorallians.
For a recent summary of research into cold-water corals see the new book edited by André Freiwald and J Murray Roberts 'Cold-water Corals and Ecoystems'.
The biology of Lophelia pertusa and other cold-water corals has been reviewed by A.D. Rogers in 1999 and forms an excellent place to start for in-depth data on many aspects of cold-water coral biology:
Rogers, A. D. (1999). "The biology of Lophelia pertusa (LINNAEUS 1758) and other deep- water reef-forming corals and impacts from human activities." International Review Of Hydrobiology 84(4): 315-406.