Geodesic
A generalization of Chentsov's projection estimates
Zapiski Nauchnykh Seminarov POMI, Probability and statistics. Part 19, Tome 412 (2013), pp. 181-206

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In 1962, N. N. Chentsov suggested the following method of estimation a functional parameter $\theta$ belonging to a Hilbert space $H$. He suggested to project $\theta$ on finite-dimensional subspaces of $H$ and consider as estimates of $\theta$ estimates of these projections. In this paper, we suggest to consider the projections on all reproducing kernel subspaces of $H$. 
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     author = {I. A. Ibragimov},
     title = {A generalization of {Chentsov's} projection estimates},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {181--206},
     publisher = {mathdoc},
     volume = {412},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_412_a8/}
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I. A. Ibragimov. A generalization of Chentsov's projection estimates. Zapiski Nauchnykh Seminarov POMI, Probability and statistics. Part 19, Tome 412 (2013), pp. 181-206. http://geodesic.mathdoc.fr/item/ZNSL_2013_412_a8/