Key points are not available for this paper at this time.
The XMM-LSS survey. Survey design and first results*, Marguerite Pierre, Ivan Valtchanov, Bruno Altieri, Stefano Andreon, Micol Bolzonella, Malcolm Bremer, Ludovic Disseau, Sergio Dos Santos, Poshak Gandhi, Christophe Jean, Florian Pacaud, Andrew Read, Alexandre Refregier, Jon Willis, Christophe Adami, Danielle Alloin, Mark Birkinshaw, Lucio Chiappetti, Aaron Cohen, Alain Detal, Pierre-Alain Duc, Eric Gosset, Jens Hjorth, Laurence Jones, Olivier Le Fevre, Carol Lonsdale, Dario Maccagni, Alain Mazure, Brian McBreen, Henry McCracken, Yannick Mellier, Trevor Ponman, Hernan Quintana, Huub Rottgering, Alain Smette, Jean Surdej, Jean-Luc Starck, Laurent Vigroux, Simon White
Pierre et al. (2004) studied this question.