ENVIRONMENT. TECHNOLOGY. RESOURCES
15th International Scientific and Practical Conference. June 27-28, 2024, ''Vasil Levski'' National Military University, Veliko Tarnovo, Bulgaria
Kleimenov, Sergey, <p> </p><p><span>Pskov State University</span></p><p><span><span>Herzen State Pedagogical University of Russia</span><br /></span></p>, Russian Federation