@Article{ 
  GuiGünPal15,
  author = { Guidetti, Davide and Güneysu, Batu and Pallara, Diego },
  title = { On some generalisations of Meyers-Serrin Theorem },
  journal = {  },
  year = { 2015 },
  volume = { 1 },
  pages = { 116-127 },
  URL = { http://cvgmt.sns.it/paper/3549/ },
  note = { cvgmt preprint}
}