“…[16,30], to see interesting results in the theory of fractional calculus and fractional differential equations, the reader may consult the monographs by; Abbas et al [8,9], Kilbas et al [22], Oldham et al [26], Podlubny [27], Samko et al [28], Zhou et al [33], and the papers by Abbas et al [3,5], Benchohra et al [12], Lakshmikantham et al [23,24,25]. Other recent results are provided in [11,13,17,18,19,20,21,29,31,32]. Attractivity results for various classes of fractional differential equations are considered in [1,2,4,6,10].…”