@Article{ 
  MetPal0,
  author = { Metafune, Giorgio and Pallara, Diego },
  title = { Trace Formulas for Some Singular Differential Operators and applications },
  journal = { Math. Nachr. },
  year = { 2000 },
  volume = { 211 },
  pages = { 127-157 },
  URL = { http://cvgmt.sns.it/paper/2398/ },
  note = { cvgmt preprint}
}