1. Baetz, W.; Kroll, A.; Soldan, S.   On Gas Leak Detection of Pressurised Components by Using Thermograms and Pattern Recognition Algorithms.   In Bieth, M., editor, Proc. 8th Int. Conf. on NDE in Relation to Structural Integrity for Nuclear and Pressurised Components, pp. 503-512, Berlin, Germany, 29. September -- 1. Oktober 2010. European Commission, Joint Research Center, Institute for Energy.   DGZfP-Proceedings BB 125-CD.
2. Kroll, A.; Baetz, W.; Peretzki, D.; Bonow, G.   Als Roboter ausgebildete Vorrichtung zur autonomen, mannlosen Ermittlung von Leckagen unter Stofffreisetzung ins Umfeld aus druckführenden Systemen, insbesondere Rohrleitungssystemen, sowie Verfahren zum Betrieb eines solchen Roboters, 2010.   WO 2010 028619 A1.
3. Baetz, W.; Kroll, A.; Bonow, G.   Mobile Robots with Active IR-Optical Sensing for Remote Gas Detection and Source Localization.   In Kazuhiro Kosuge, K. I., editor, IEEE International Conference on Robotics and Automation (ICRA 2009), pp. 2773-2778, Kobe, Japan, May 12-17 2009. IEEE.   IEEE Catalog Number: CFP09RAA-DVD.
4. Kroll, A.; Baetz, W.; Peretzki, D.   On Autonomous Detection of Pressured Air and Gas Leaks Using Passive IR-Thermography for Mobile Robot Application.   In Kazuhiro Kosuge, K. I., editor, IEEE International Conference on Robotics and Automation (ICRA 2009), pp. 921-926, Kobe, Japan, May 2009.   IEEE Catalog Number: CFP09RAA-DVD.
5. Göken, J.; K. Bergmann, K.; Baetz, W.; Steinhoff, K.   Functional gradation of gear shafts made of cementation steel and its influence on damping and microstructure.   In Materials Characterization, Vol. 57, pp. 137-149, 2006.   ISSN: 1044-5803.
6. Baetz, W.; Holzapfel, W.; Nath, B.; Dietrich, H.   Beam Configuration for Light Sheet Application.   In Measurement, Vol. 38, pp. 42-52, 2005.   ISBN: 0263-2241.
7. Baetz, W.; Braasch, J.; W. Holzapfel, W.   Noise-modulated optical distance-measuring system.   In IEEE Transactions on Industrial Electronics Special Section on "Opto-Mechatronics", Vol. 52, pp. 944-952, 2005.
8. Naghibi Saber, S. M.AND Baetz, W.; Holzapfel, W.   Simultaneous Measurement of Surface Topology and Material Distribution by Polarization Detection.   In Proceedings of SPIE Optical Measurement Systems for Industrial Inspection III, Vol. 5144, pp. 197-205, 2003.   ISBN 0-8194-5014-6.
9. Holzapfel, W.; Baetz, W.   Signal Processing in Optical Distance Sensors applying Noise FM and Coherent Detection.   In Tagungsband 47. Wissenschaftliche Kolloquium,, Vol.  47, pp. 504-505, 2002.   ISBN 0943-7207.
10. Baetz, W.; Holzapfel, W.   Absolute-Distance Interferometry (ADI) with Randomly Modulated Optical Wavelength.   In Yoshizawa, T., editor, Proceedigs of the SPIE "Optomechatronic Systems III", Vol. 4902, pp. 270-274, 2002.   ISBN 0-8194-4689-0.
11. Nath, B.; Löber, W.; Baetz, W.; Holzapfel, W.   Laser Light Sheet Imaging of Gas Flow with Laser Diodes.   In Optical Diagnostics in Engineering, Vol. 3, No. 1, pp. 102 -- 109, 1999.   ISBN 1364-4173.
12. Nath, B.; Dietrich, H.; Baetz, W.; Holzapfel, W.   High Speed Gas Flow Diagnosis with Semiconductor Lasers.   In Proceedings of IMEKO XV World Congress Photonic Measurements, Optical Measurements and Laser Applications, Vol.  11, pp. 25 -- 32, 1999.   ISBN 4-907764-10-3.
13. Nath, B.; Löber, W.; Baetz, W.; Holzapfel, W.   Laser Light Sheet Imaging of Gas Flow with Laser Diodes,.   In Proceedings of the 8th International Symposium on Flow Visualization, pp. 99-102, 1998.   ISBN 0953399109.
14. Nath, B.; Löber, W.; Baetz, W.; Holzapfel, W.   Gas Flow Visualization by Laser Diode Light Sheet Imaging.   In 9th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Vol.  1, 1998.
15. Nath, B.; Löber, W.; Baetz, W.; Holzapfel, W.   Application of Laser Diodes to Gas Flow Diagnosis.   In Proceedings of the International Workshop on Flow Diagnosis Techniques, pp. 157-164, 1998.   ISBN 5-7320-0514-5.
16. Holzapfel, W.; Baetz, W.; Settgast, W.   Schwingsaitenwaage.   In IMAT-Bericht MT, Vol. 9, No. 9, pp. 106, 1997.   ISBN 3-88122-923-X.
17. Holzapfel, W.; Baetz, W.; Braasch, J.; Hölscher, M.   Rauschmodulierter Laserdioden-E-Messer.   In IMAT-Bericht MT, Vol. 14, No. 14, pp. 222, 1997.   ISBN 3-88122-925-6.
18. Holzapfel, W.; Baetz, W.; Braasch, J.; Hölscher, M.   Rauschmodulierter Laserdioden-E-Messer VDI-TZ-Broschüre zur Abschlußpräsentation des vom BMBF geförderten Verbundprojektes 3D-Objektvermessung auf größere Entfernungen S.43-56, 1996.
19. Holzapfel, W.; Baetz, W.; Braasch, J. C.   Coherent optical rangefinder with stochastically frequency-modulated semiconductor laser.   In Proceedings of XIII IMEKO World Congress, Vol.  3, pp. 1695-1700, 1994.   Measurement of Geometrical Quantities.
20. Holzapfel, W.; Baetz, W.; Braasch, J.   Noise-modulated laser diode interferometer and its application to range finding.   In SPIE-Proceedings, Vol. 2004, pp. 71-76, 1993.   ISBN 0-8194-1253-8.
21. Holzapfel, W.; Baetz, W.   Schwingungsuntersuchung an optischen Bänken mit Kunststoffwabenkern.   In IMAT-Bericht MT, Vol. 13, No. 13, pp. 79, 1992.   ISBN 3-88122-681-8.
22. Holzapfel, W.; Baetz, W.; Braasch, J.; Hölscher, M.; Neuschaefer-Rube, U.   Laserdioden-Beschleunigungsmesser.   In IMAT-Bericht MT, Vol. 6, No. 6, pp. 171, 1991.   ISBN 3-88122-625-7.
23. Holzapfel, W.; Baetz, W.   Statistisch-dynamische Vermessung von piezoelektrischen Aktuatoren.   In IMAT-Bericht MT 2, Vol. 2, No. 2, pp. 41, 1991.   ISBN 3-88122-543-9.
24. Holzapfel, W.; Baetz, W.   Schwingungsanalyse an einer Hochleistungsbandsäge.   In IMAT-Bericht MT, Vol. 4, No. 4, pp. 15, 1991.   ISBN 3-88122-623-0.
25. Baetz., W.; Holzapfel, W.; Neuschaefer-Rube, U.   A New Method of Force Sensing Utilizing Resonant Amplification of Induced Optical Phase Anisotropies.   In Proceedings of IMEKO XII, Vol. Measurement of force, mass, pressure, flow and vibration, pp. 310-315, 1991.   ISBN 7-80003-175-6/TB. 18.
26. Holzapfel, W.; Baetz, W.; Braasch, J.; Neuschaefer-Rube, U.   Force Measuring Sensor applying Transmission Ellipsometric Principles.   In Applied Optics Digest, pp. 49-50, 1990.   ISBN 0-85498-528-X.
27. Baetz, W.; Holzapfel, W.   Vibration Measurement by Closed-Loop Laser-Interferometry.   In SPIE-Proceedings, editor, Interferometry, Vol. 1121, pp. 458-469, 1989.   ISBN 0-8194-0157-9.
28. Baetz, W.; Holzapfel, W.   Laserinterferometer-Anordnung für kombinierte Translations- und Kippwinkelmessung.   In VDI-Berichte, Vol. 749, pp. 177-191, 1989.   ISBN 3-18-090749-5.
29. Baetz, W.; Holzapfel, W.   Laserinterferometer mit linearem Übertragungsverhalten zur Messung mechanischer Schwingungen.   In der Deutschen Gesellschaft für angewandte Optik, T., editor, 88. Tagungsband der Deutschen Gesellschaft für angewandte Optik, Vol.  88, pp.  50, 1987.
30. Holzapfel, W.; Settgast, W.; Baetz, W.   Meßtechnischer Vergleich passiver Schwingungsisolationssysteme mit Luftkammerelementen und Niveauregelung.   In Konstruktion, Vol. 38, No. 4, pp. 139-148, 1986.