Yakovlev S.P.
Tula State University
Tula, Russian Federation
![Yakovlev S.P. Yakovlev S.P.](/authors/395.jpg)
S.P. Yakovlev - D. Sc. (Eng.), professor of the Tula State University.
All articles by this authorTula State University
Tula, Russian Federation
S.P. Yakovlev - D. Sc. (Eng.), professor of the Tula State University.
All articles by this author