1 Subjects: “...back-up roller...”

2 Subjects: “...back-filling concrete...”

3 Subjects: “...back-calculation in geomechanics...”

4 Subjects: “...feed-back processes...”

5 Subjects: “...back propagation neural network...”

6 Subjects: “...back-analysis...”

7 Subjects: “...back propagation (BP) neural network...”

8 Subjects: “...back-break...”

9 Subjects: “...back-break...”