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Gandaglia G, Karl A, Novara G, de Groote R, Buchner A, D'Hondt F, Montorsi F, Stief C, Mottrie A, Gratzke C.Gandaglia G, et al. Among authors: karl a.Eur J Surg Oncol. 2016 Nov;42(11):1736-1743. doi: 10.1016/j.ejso.2016.02.254. Epub 2016 Mar 19.Eur J Surg Oncol. 2016.PMID: 27032295
Zaak D, Karl A, Knüchel R, Stepp H, Hartmann A, Reich O, Bachmann A, Siebels M, Popken G, Stief C.Zaak D, et al. Among authors: karl a.BJU Int. 2005 Aug;96(2):217-22. doi: 10.1111/j.1464-410X.2005.05604.x.BJU Int. 2005.PMID: 16001963Review.
Hungerhuber E, Schlenker B, Frimberger D, Linke R, Karl A, Stief CG, Schneede P.Hungerhuber E, et al. Among authors: karl a.World J Urol. 2006 Aug;24(3):319-24. doi: 10.1007/s00345-006-0073-3. Epub 2006 Apr 11.World J Urol. 2006.PMID: 16688459
Hungerhuber E, Schlenker B, Karl A, Frimberger D, Rothenberger KH, Stief CG, Schneede P.Hungerhuber E, et al. Among authors: karl a.Urology. 2006 Sep;68(3):621-5. doi: 10.1016/j.urology.2006.03.052. Epub 2006 Sep 18.Urology. 2006.PMID: 16979733
Hungerhuber E, Stepp H, Kriegmair M, Stief C, Hofstetter A, Hartmann A, Knuechel R, Karl A, Tritschler S, Zaak D.Hungerhuber E, et al. Among authors: karl a.Urology. 2007 Feb;69(2):260-4. doi: 10.1016/j.urology.2006.10.015.Urology. 2007.PMID: 17320660
Gratzke C, Schlenker B, Seitz M, Karl A, Hermanek P, Lack N, Stief CG, Reich O.Gratzke C, et al. Among authors: karl a.J Urol. 2007 Apr;177(4):1419-22. doi: 10.1016/j.juro.2006.11.062.J Urol. 2007.PMID: 17382744
Zaak D, Karl A, Stepp H, Tritschler S, Tilki D, Burger M, Knuechel R, Stief C.Zaak D, et al. Among authors: karl a.Urologe A. 2007 Nov;46(11):1519-27. doi: 10.1007/s00120-007-1563-7.Urologe A. 2007.PMID: 17928985Review.German.
Hungerhuber E, Schlenker B, Schneede P, Stief CG, Karl A.Hungerhuber E, et al. Among authors: karl a.Urology. 2007 Nov;70(5):975-9. doi: 10.1016/j.urology.2007.07.013.Urology. 2007.PMID: 18068457