C. Marc, A. Kennedy, and . Hagan, Predicting the output from a complex computer code when fast approximations are available, Biometrika, vol.87, issue.1, pp.1-13, 2000.

V. Picheny and D. Ginsbourger, A Nonstationary Space-Time Gaussian Process Model for Partially Converged Simulations, SIAM/ASA Journal on Uncertainty Quantification, vol.1, issue.1, pp.57-78, 2013.
DOI : 10.1137/120882834

R. Tuo, C. F. Wu, and D. Yu, Surrogate Modeling of Computer Experiments With Different Mesh Densities, Technometrics, vol.7, issue.3, pp.372-380, 2014.
DOI : 10.1198/TECH.2011.10025