1 Subjects: “...individual differences...”

2 Subjects: “...sex differences...”

3 Subjects: “...cultural differences...”

4 Subjects: “...divided difference operator...”

5 Subjects: “...invariantized difference scheme...”

6 Subjects: “...difference-in-differences...”

7 Subjects: “...difference...”

8 Subjects: “...cultural difference...”

9 Subjects: “...modified normalized difference water index (MNDWI)...”

10 Subjects: “...modified normalized difference water index (MNDWI)...”

11 Subjects: “...fractional differential-difference equations...”

12 Subjects: “...finite difference time domain...”

13 Subjects: “...optimal estimation of flux difference integral...”

14 Subjects: “...Difference of Gaussian...”