The function appears in the example of the book by Santner et al. (2018)[^Santner2018]. The function was used to illustrate Kriging metamodeling.
[^Santner2018]: T. J. Santner, B. J. Williams, and W. I. Notz, The Design and Analysis of Computer Experiments. in Springer Series in Statistics. New York, NY: Springer New York, 2018. doi: 10.1007/978-1-4939-8847-1.
The function appears in the example of the book by Santner et al. (2018)[^Santner2018]. The function was used to illustrate Kriging metamodeling.
[^Santner2018]: T. J. Santner, B. J. Williams, and W. I. Notz, The Design and Analysis of Computer Experiments. in Springer Series in Statistics. New York, NY: Springer New York, 2018. doi: 10.1007/978-1-4939-8847-1.