Peter Z. G. Qian, Huaiqing Wu, C. F. Jeff Wu. Gaussian Process Models for Computer Experiments With Qualitative and Quantitative Factors. Technometrics, 50(3):383-396, 2008. [doi]
@article{QianWW08,
title = {Gaussian Process Models for Computer Experiments With Qualitative and Quantitative Factors},
author = {Peter Z. G. Qian and Huaiqing Wu and C. F. Jeff Wu},
year = {2008},
doi = {10.1198/004017008000000262},
url = {http://dx.doi.org/10.1198/004017008000000262},
researchr = {https://researchr.org/publication/QianWW08},
cites = {0},
citedby = {0},
journal = {Technometrics},
volume = {50},
number = {3},
pages = {383-396},
}