To the attention of authors and readers of the journal!

In 2021 the journal comes out every three months:

• Vol. 21 No. 1 — March 25 (article submission deadline: February 25);
• Vol. 21 No. 2 — June 25 (article submission deadline: May 25);
• Vol. 21 No. 3 — September 25 (article submission deadline: August 25);
• Vol. 21 No. 4 — December 25 (article submission deadline: November 25).

Manuscripts are submitted online.