TY - JOUR TI - The Existence of Positive Solutions and A Lyapunov Type Inequality for Boundary Value Problems of the Fractional Caputo-Fabrizio Differential Equations AU - TOPRAKSEVEN, Å. JO - Sigma Journal of Engineering and Natural Sciences PY - 2019 VL - 37 SP - 1129 EP - 1137 DO - ER -