^Palaty J, Konforte D, Karakosta T, Wong E, Stefan C (March 2018). "Rapid identification of cyclopropyl fentanyl/crotonyl fentanyl in clinical urine specimens: A case study of clinical laboratory collaboration in Canada". Clinical Biochemistry. 53: 164–167.
doi:
10.1016/j.clinbiochem.2018.01.013.
PMID29395089.
^Palaty J, Konforte D, Karakosta T, Wong E, Stefan C (March 2018). "Rapid identification of cyclopropyl fentanyl/crotonyl fentanyl in clinical urine specimens: A case study of clinical laboratory collaboration in Canada". Clinical Biochemistry. 53: 164–167.
doi:
10.1016/j.clinbiochem.2018.01.013.
PMID29395089.