@TECHREPORT{BohannonPierceVaughanTR,
  AUTHOR = {Aaron Bohannon and Jeffrey A. Vaughan and
                  Benjamin C. Pierce},
  TITLE = {Relational Lenses: {A} Language for Updateable Views},
  YEAR = {2005},
  MONTH = DEC,
  INSTITUTION = {Dept. of Computer and Information Science,
                  University of Pennsylvania},
  NUMBER = {MS-CIS-05-27}
}