@unpublished{GriebelLiRieger,
  author = {Griebel, Michael and Li, Guanglian and Rieger, Christian},
  title = {On the Numerical Approximation of the {Karhunen-Loève}
Expansion for Random Fields with Random Discrete Data},
  annote = {article, inspreprint},
  note = {Available as INS Preprint No. 2106},
  inspreprintnum = {2106},
  year = {2021}
}