A new definition of fractional derivative. - Roshdi Khalil; Mohammed Al Horani; Abdelrahman Yousef; Mohammad Sababheh (J. Comput. Appl. Math., 2014)

The Invariant Subspace Problem for Separable Hilbert Spaces. - Roshdi Khalil; Abdelrahman Yousef; Waseem Ghazi Alshanti; Ma'mon Abu Hammad (Axioms, 2024)