Correspondence address:
18 Kremlevskaya Str., Kazan, Republic of Tatarstan, 420008 Russia
E-mail: uz.ku@kpfu.ru


Dear Authors,

If you use Gmail to send electronic letters, please do not forget to check your Spam Folder in case our e-mails got delivered there instead of your Inbox Folder. If so, select the letter sent by the editorial board and click “not spam” for future messages to get through.


The content is available under the license Creative Commons Attribution 4.0 License.