1. Prof. N. A. SobolevDepartamento de Física and I3NUniversidade de Aveiro3810‐193AveiroPortugal
2. Prof. N. A. SobolevNational University of Science and Technology MISiS119049MoscowRussia
3. Dr. F. DjurabekovaDepartment of PhysicsUniversity of Helsinki00014HelsinkiFinland
4. Dr. E. A. KotominInstitute of Solid State PhysicsUniversity of LatviaRigaLV‐1063Latvia