- edp sciences23
- nature publishing group6
- caaul, lisbon, portugal.5
- cab, madrid, spain.5
- cab, madrid, spain.;inta, aguilas, spain.5
- caltech, pasadena, ca 91125 usa.5
- cardiff univ, cardiff cf10 3ax, s glam, wales.5
- caup, oporto, portugal.5
- cea saclay, f-91191 gif sur yvette, france.5