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Shiban E, Janssen I, Wostrack M, Krieg SM, Ringel F, Meyer B, Stoffel M.Shiban E, et al. Among authors: ringel f.Acta Neurochir (Wien). 2014 Jun;156(6):1189-96. doi: 10.1007/s00701-014-2058-0. Epub 2014 Mar 27.Acta Neurochir (Wien). 2014.PMID: 24671549
Stoffel M, Wolf I, Ringel F, Stüer C, Urbach H, Meyer B.Stoffel M, et al. Among authors: ringel f.J Neurosurg Spine. 2007 Apr;6(4):313-9. doi: 10.3171/spi.2007.6.4.5.J Neurosurg Spine. 2007.PMID: 17436919Clinical Trial.
Stoffel M, Behr M, Ringel F, Stuer C, Meyer B.Stoffel M, et al. Among authors: ringel f.Zentralbl Neurochir. 2007 May;68(2):50-8. doi: 10.1055/s-2007-980171.Zentralbl Neurochir. 2007.PMID: 17614084
Kristof RA, Kiefer T, Thudium M, Ringel F, Stoffel M, Kovacs A, Mueller CA.Kristof RA, et al. Among authors: ringel f.Eur Spine J. 2009 Dec;18(12):1951-6. doi: 10.1007/s00586-009-1110-x. Epub 2009 Aug 7.Eur Spine J. 2009.PMID: 19662441Free PMC article.
Stoffel M, Behr M, Reinke A, Stüer C, Ringel F, Meyer B.Stoffel M, et al. Among authors: ringel f.Acta Neurochir (Wien). 2010 May;152(5):835-43. doi: 10.1007/s00701-009-0583-z. Epub 2010 Jan 19.Acta Neurochir (Wien). 2010.PMID: 20084412