@Article{ 
  catmaz,
  author = { Catino, Giovanni and Mazzieri, Lorenzo },
  title = { Connected sum construction for sigma$_k$-Yamabe metrics },
  journal = { J. Geom. Anal. },
  year = { 2013 },
  volume = { 23 },
  number = { 2 },
  pages = { 812-854 },
  URL = { http://cvgmt.sns.it/paper/369/ },
  note = { cvgmt preprint}
}