G.G. Vertogradov – Dr.Sc.(Phys.-Math.), Professor,
Southern Federal University (Rostov-on-Don)
Head of Department, JSC «VNII «Gradient» (Rostov-on-Don)

E-mail: vertogradovgg@gmail.com

V.G. Vertogradov – Ph.D.(Phys.-Math.), Head of Department,
JSC «VNII «Gradient» (Rostov-on-Don)

E-mail: v.vitaly@yandex.ru