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Barthel, Rainer / Tutsch, Joram / Kayser, Christian / Jordan, Joseph (2016): Ein bautechnisches Kunstwerk auf dem Prüfstand - Der gotische Turmhelm des Freiburger Münsters. Dans: Bundesingenieurkammer (2016): Ingenieurbaukunst 2017. Ernst & Sohn, Berlin (Allemagne), ISBN 9783433031674, pp. 38-45.
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Barthel, Rainer / Tutsch, Joram / Jordan, Joseph (2016): The Gothic tower of Freiburg Minster, Germany: analysis and repair. Dans: Proceedings of the Institution of Civil Engineers - Engineering History and Heritage, v. 169, n. 2 (mai 2016), pp. 68-83.
https://doi.org/10.1680/jenhh.16.00001
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Barthel, Rainer / Tutsch, Joram / Jordan, Joseph (2017): The Gothic Tower of Freiburg Minster, Germany: Analysis and Repair. Dans: Pelke, Eberhard (2017): Engineering History and Heritage Structures – Viewpoints and Approaches. International Association for Bridge and Structural Engineering (IABSE), Zurich (Suisse), ISBN 978-3-85748-154-3, pp. 107-112.
https://doi.org/10.2749/sed015.107
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Kayser, Christian (2018): Iron on top. The use of wrought iron armatures in the construction of late Gothic openwork spires. Présenté pendant: 6th International Congress on Construction History (6ICCH 2018), July 9-13, 2018, Brussels, Belgium, pp. 795-802.