@TECHREPORT {SFB649DP2015-053,
  AUTHOR={Breunig, Christoph and Hoderlein, Stefan},
  TITLE={{Specification Testing in Random Coefficient Models}},
  YEAR=2015,
  INSTITUTION={Sonderforschungsbereich 649, Humboldt Universit\"{a}t zu Berlin, Germany},
  TYPE={SFB 649 Discussion Paper},
  NOTE={available at http://sfb649.wiwi.hu-berlin.de/papers/pdf/SFB649DP2015-053.pdf},
  NUMBER={2015-053}
}