1 Subjects: “...second-order differential equations...”

2 Subjects: “...simultaneous differential equations...”

3 Subjects: “...delay random differential equation...”

4 Subjects: “...mixed neutral differential equations...”

5 Subjects: “...fractional differential equation...”

6 Subjects: “...fractional differential equations...”

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

8 Subjects: “...differential equations model...”

9 Subjects: “...system of ordinary differential equations...”

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

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

12 Subjects: “...fractional differential equations...”

13 Subjects: “...fractional differential equation...”

14 Subjects: “...fractional differential equations...”

15 Subjects: “...fractional differential equations...”

16 Subjects: “...ordinary differential equation...”

17 Subjects: “...interval ordinary differential equations (ODEs)...”

18 Subjects: “...Itô stochastic differential equation...”

19 Subjects: “...stochastic differential equations...”

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