Braun, Patrick. "Unclear results in the article by Wolff and Gerritzen in Clin Chem Lab Med 2007;45(7):917–922" Clinical Chemical Laboratory Medicine, 46.3 (2008): 424-424. Retrieved 19 Jun. 2013, from doi:10.1515/CCLM.2008.085

Braun, P. (2008). Unclear results in the article by Wolff and Gerritzen in Clin Chem Lab Med 2007;45(7):917–922. Clinical Chemical Laboratory Medicine, 46(3), pp. 299-426. Retrieved 19 Jun. 2013, from doi:10.1515/CCLM.2008.085

Braun, Patrick. 2008. Unclear results in the article by Wolff and Gerritzen in Clin Chem Lab Med 2007;45(7):917–922. Clinical Chemical Laboratory Medicine. 46(3): 299-426. Retrieved 19 Jun. 2013, from doi:10.1515/CCLM.2008.085