We are pleased to announce that with the end of July our research group was enlarged by dr. Yurij Sharlai from Kharkiv. He is our long-term collaborator and co-author of the publications. Dr. Sharlai was a beneficiary of a support program for scientists from Ukraine organized by the Polish Academy of Sciences (PAS) and the United States National Academy of Sciences (NAS). From now on, for the next year, he will carry out tasks at the INTiBS PAN as part of a special program of the National Science Center for scientists from Ukraine.