“…In recent years, many researchers have paid attention to fractional calculus as it has plenteous applications in the fields of viscoelasticity, porous media, control, electromagnetic, and so on. It is more suitable for the description of many physical phenomena arising in economics, science, and engineering as compared to classical derivatives and integrals (see, for instance, [21,24,28,22,4,20] and references therein). In 2000, Hilfer [14] introduced the new definition of fractional derivative (known as Hilfer fractional derivative) which is a generalization of Riemann-Liouville fractional derivative as well as an interpolation between Riemann-Liouville and Caputo's fractional derivative.…”