1. Department of Optoelectronic Methods and Techniques for Restoration and Conservation of Cultural Heritage, National Institute for Research and Development for Optoelectronics – INOE 2000, Măgurele, Romania
2. Department of Laser, Atomic, Molecular and Plasma Physics, Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria
3. National Archaeological Institute with Museum, Bulgarian Academy of Sciences, Sofia, Bulgaria