@manual{sgd,
  author = {Matthew Plumlee},
  title = {{Sparse Grid Designs}},
  url = {https://www.mathworks.com/matlabcentral/fileexchange/45668-sparse-grid-designs},
  software = {1},
  year = {2013},
  abstract = {This MATLAB package enables Gaussian process prediction with very large sample sizes using sparse grid designs. }
}