“…In the aspect of mathematical theory and application, to obtain further information of the relative natural phenomena, many authors are interested in the existence and properties of solutions for fractional differential models [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] and many analytical techniques and methods have been developed to solve various differential equations, such as iterative methods [28][29][30][31][32][33][34][35][36][37], the Mawhin continuation theorem for resonance [38][39][40], the topological degree method [41,42], the fixed point theorem [43][44][45][46][47][48][49][50][51][52][53][54][55], the variational method [56][57][58]…”