C. Oleff, Proaktives Management von Anforderungsänderungen in der Entwicklung komplexer technischer Systeme, vol. 406. Paderborn: LibreCat University, 2022.

I. Gräßler and C. Oleff, Systems Engineering - verstehen und industriell umsetzen. Berlin: Springer Verlag, 2022.

I. Gräßler, C. Oleff, M. Hieb, and D. Preuß, “Automated Requirement Dependency Analysis for Complex Technical Systems,”10.1017/pds.2022.189__Proceedings of the Design Society, vol. 2, pp. 1865–1874, 2022, doi:10.1017/pds.2022.189 .

I. Gräßler, D. Wiechel, and C. Oleff, “Extended RFLP for complex technical systems,” presented at the 8th IEEE International Symposium on Systems Engineering, Wien, 2022.

I. Gräßler, C. Oleff, and D. Preuß, “Proactive Management of Requirement Changes in the Development of Complex Technical Systems,”10.3390/app12041874__Applied Sciences, vol. 12, no. 4, Art. no. 1874, 2022, doi:10.3390/app12041874 .

I. Gräßler, D. Wiechel, A.-S. Koch, D. Preuß, and C. Oleff, “Model-Based Effect-Chain Analysis for Complex Systems,”10.1017/pds.2022.191__Proceedings of the Design Society, vol. 2, pp. 1885–1894, 2022, doi:10.1017/pds.2022.191 .

B. Menninger et al., “Modeling and analysis of functional variance of complex technical systems,”10.35199/dfx2022.15__2022, doi:10.35199/dfx2022.15 .

I. Gräßler, C. Oleff, and P. Scholle, “Strategisch-technische Anforderungsanalyse,” in Mehrzieloptimierte und durchgängig automatisierte Bauteilentwicklung für Additive Fertigungsverfahren im Produktentstehungsprozess, 1st ed., R. Koch, I. Gräßler, D. Zimmer, and T. Tröster, Eds. Düren: Shaker, 2021, pp. 31–49.

I. Gräßler, C. Oleff, and D. Preuß, “Holistic change propagation and impact analysis in requirements management,” Strathclyde/Glasgow, 2021.

I. Gräßler, J. Pottebaum, C. Oleff, and D. Preuß, “Handling of explicit Uncertainty in Requirements Change Management,”10.1017/pds.2021.430__Proceedings of the Design Society, vol. 1, pp. 1687–1696, 2021, doi:10.1017/pds.2021.430 .

I. Gräßler, D. Preuß, and C. Oleff, “Automatisierte Identifikation und Charakterisierung von Anforderungsabhängigkeiten – Literaturstudie zum Vergleich von Lösungsansätzen,” in Proceedings of the 31st Symposium Design for X (D); 16. - 18. Sep. 2020, 2020, pp. 199–208.

I. Gräßler, C. Oleff, and P. Scholle, “Method for Systematic Assessment of Requirement Change Risk in Industrial Practice,” Applied Sciences 23/2020 (23), p. 8697, 2020.

P.-P. Ley et al., “A METHODICAL APPROACH TO INTEGRATED PRODUCT DEVELOPMENT IN TOTAL HIP ARTHROPLASTY,”10.1017/dsd.2020.271__Proceedings of the Design Society: DESIGN Conference, vol. 1, pp. 2009–2018, 2020, doi:10.1017/dsd.2020.271 .

I. Gräßler and C. Oleff, “Risikoorientierte Analyse und Handhabung von Anforderungsänderungen,” in Design fox X - Beiträge zum 30. DfX-Symposium September 2019, Band 30, Jesteburg, 18. - 19. Sep. 2019, 2019, vol. 30, pp. 49–60.

I. Gräßler, C. Oleff, and P. Taplick, “Augmented Reality für die Vermittlung von Systems Engineering,” in Fachtagung Mechatronik 2019 Paderborn, 2019, pp. 180–185.

I. Gräßler, H. Thiele, C. Oleff, P. Scholle, and V. Schulze, “Method for Analysing Requirement Change Propagation based on a Modified Pagerank Algorithm,”10.1017/dsi.2019.375__Proceedings of the Design Society: International Conference on Engineering Design, vol. 1, no. 1, pp. 3681–3690, 2019, doi:10.1017/dsi.2019.375 .

I. Gräßler, C. Oleff, and J. Hentze, “Role Model for Systems Engineering Application,”10.1017/dsi.2019.132__Proceedings of the Design Society: International Conference on Engineering Design, vol. 1, no. 1, pp. 1265–1274, 2019, doi:10.1017/dsi.2019.132 .

I. Gräßler, C. Oleff, and P. Scholle, “Methode zur Bewertung von Anforderungsänderungen additiv gefertigter Produkte,” in Design for X - Beiträge zum 29. DfX-Symposium, Band 29, 2018, vol. 29, pp. 333–344.

I. Gräßler, J. Hentze, and C. Oleff, “Systems Engineering Competencies in Academic Education,” in  13th System of Systems Engineering Conference (SoSE), Paris, France, 19. - 22. Jun. 2018, 2018, pp. 542–547.