Test instances for the problems allocating and sequencing mobile orders and racks to pickers

The test instances found here were the ones used in the following works:

Valle, Cristiano Arbex, and John E. Beasley
Order allocation, rack allocation and rack sequencing for pickers in a mobile rack environment
Computers and Operations Research 125 (2021): 105090.

Valle, Cristiano Arbex, and John E. Beasley
A two-stage approach for order and rack allocation in a mobile rack environment
arXiv preprint arXiv:2110.11550 (2021).

Cristiano Arbex Valle and John E Beasley

Test instances files:

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