## Data Source
This is a random data set generated by the author of this paper using the method reported in [Beasley 1990](https://www.tandfonline.com/doi/abs/10.1057/jors.1990.166).

The coordinates of nodes in B700 and B900 refer to pmed32.txt (https://people.brunel.ac.uk/~mastjjb/jeb/orlib/files/pmed32.txt) and pmed39.txt (https://people.brunel.ac.uk/~mastjjb/jeb/orlib/files/pmed39.txt) in Beasley's OR-Library, respectively. 

Note that the demand information is randomly generated by the author following normal distribution $N (80, 15)$.
