Mouffak Benchohra & Soufyane Bouriah 
Fractional Differential Equations [PDF ebook] 
A Coincidence Degree Approach

This book is devoted to the existence and uniqueness results for various classes of problems with periodic conditions. All of the problems in this book deal with fractional differential equations and some fractional derivatives such as the Riemann-Liouville, Caputo and Hilfer fractional derivatives. Classical fixed point theorems as well as the coincidence degree theory of Mawhin are employed as tools.