Proceedings of the 6th International Conference on \"Non-Destructive Testing and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage\", Rome, May, 17th - 20th 1999 S. 247 - 255
Proceedings of the 5th International Conference on Non-Destructive Testing, Microanalytical Methods and Environmental Evaluation for Study and Conservation of Works on Art, Budapest, 1996 S. 287 - 300