Great sorrow has befallen our family. On February 22, my brother Sergei Petrik was killed at the area ATO near Volnovaha. February 25, we buried the loved one - the good son, brother, husband and father of two small children in the village Peremoga of the Nezhinsk region, Chernigov province.

We thank and express our sincere gratitude to the good and sensitive people - the vice-chancellor NTUU "KPI" Peter Alekseevich Kyrychok, Acting Director of IPP Tatiana Yuryevna Kyrychok and all the staff of the IPP. Your attention, warmth and compassion support us our sorrow.

Thank you, dear colleagues!

With respect and gratitude family of Olga Orel – senior laboratory assistant of the Department of publishing organization, polygraphy and bookselling