@INPROCEEDINGS{payaro:ISIT08,
  author = {M. Payar\'o and D. P. Palomar},
  title = {A multivariate generalization of {C}osta's entropy power inequality},
  booktitle = {Proc. IEEE International Symposium on Information Theory (ISIT'08)},
  year = {2008},
  month = {July}
}