KRIM, S., ABBAS, S., BENCHOHRA, M., & NIETO, J. J. . (2023). Implicit Caputo-Fabrizio fractional differential equations with delay. Studia Universitatis Babeș-Bolyai Mathematica, 68(4), 727–742. https://doi.org/10.24193/subbmath.2023.4.03