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Ritter M, Rassweiler MC, Häcker A, Michel MS.Ritter M, et al. Among authors: hacker a.World J Urol. 2013 Oct;31(5):1147-51. doi: 10.1007/s00345-012-0847-8. Epub 2012 Mar 4.World J Urol. 2013.PMID: 22391646
Ritter M, Siegel F, Krombach P, Martinschek A, Weiss C, Häcker A, Pelzer AE.Ritter M, et al. Among authors: hacker a.World J Urol. 2013 Feb;31(1):183-7. doi: 10.1007/s00345-012-0923-0. Epub 2012 Aug 12.World J Urol. 2013.PMID: 22885617
Michel MS, Ritter M, Schönberg S, Häcker A, Weisser G.Michel MS, et al. Among authors: hacker a.Urologe A. 2012 Jun;51(6):857-61. doi: 10.1007/s00120-012-2837-2.Urologe A. 2012.PMID: 22476741German.