@article{KlebanovSprungkSullivan2021, author = {Ilja Klebanov and Bj{\"o}rn Sprungk and T. J. Sullivan}, title = {The linear conditional expectation in Hilbert space}, journal = {Bernoulli}, volume = {27}, number = {4}, pages = {2299 -- 2299}, doi = {10.3150/20-BEJ1308}, year = {2021}, }