"Titelei" Clinical Chemistry and Laboratory Medicine, 32.7 (2009): -. Retrieved 20 May. 2013, from doi:10.1515/cclm.1994.32.7.0

Titelei. Clinical Chemistry and Laboratory Medicine (2009), 32(7), pp. 495-568. Retrieved 20 May. 2013, from doi:10.1515/cclm.1994.32.7.0

Titelei. Clinical Chemistry and Laboratory Medicine. 2009. 32(7): 495-568. Retrieved 20 May. 2013, from doi:10.1515/cclm.1994.32.7.0