@TECHREPORT{upcase-tr4,
  author = {Andr{\'e} Santos and Jo{\~a}o M. P. Cardoso and Diogo R. Ferreira and Pedro C. Diniz},
  title = {{UPCASE}: User-Programmable Context-Aware Services},
  institution = {Instituto Superior T{\'e}cnico},
  year = {2009},
  number = {TR-4-2009},
  month = {Abril}
}