@techreport{FritschHackethalWahrenburgetal.2009,
  author    = {Markus Fritsch and Andreas Hackethal and Mark Wahrenburg and Kim W{\"u}llenweber},
  title     = {The impact of business process outsourcing on firm performance and the influence of governance : a long term study in the German banking industry},
  institution = {Wirtschaftswissenschaften},
  year      = {2009},
}