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2 Subjects: “...nonlinear partial differential equations...”

3 Subjects: “...partial differential equations...”

4 Subjects: “...partial differential equation...”

5 Subjects: “...partial differential equations...”

6 Subjects: “...fractional partial differential equation...”

7 Subjects: “...partial differential equation...”

8 “... differential equations; Dynamical systems; Fractional calculus; Delays; Mathematical modeling and oscillations....”

9 “...Delay, difference, functional, fractional, and partial differential equations have many...”