@unpublished{DinesLiuSchulze2008,
  author  = {Nicoleta Dines and X. Liu and Bert-Wolfgang Schulze},
  title   = {Edge quantisation of elliptic operators},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2004) 24},
  year    = {2008},
}