1. EXISTENCE AND STABILITY OF LANGEVIN EQUATIONS WITH TWO HILFER-KATUGAMPOLA FRACTIONAL DERIVATIVES. Authors: RABHA W. IBRAHIM, SUGUMARAN HARIKRISHNAN, KUPPUSAMY KANAGARAJAN.2. GEOMETRIC PROPERTIES OF MIXED OPERATOR INVOLVING RUSCHEWEYH DERIVATIVE AND SĂLĂGEAN OPERATOR. Authors: RABHA W. IBRAHIM, MAYADA T. WAZI, NADIA AL-SAIDI.