An Open Access Journal
From: Using an integrated order picking-vehicle routing problem to study the impact of delivery time windows in e-commerce
Number of customers
Clustered customers
Randomly spread customers
2 h
4 h
50
6.3
1.82
6.88
2.54
100
3.92
0.87
5.18
1.89
150
3
0.69
4.22
1.47