@article{10_4064_am_26_3_281_291,
     author = {Waldemar Popi\'nski},
     title = {A note on orthogonal series regression function estimators},
     journal = {Applicationes Mathematicae},
     pages = {281--291},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1999},
     doi = {10.4064/am-26-3-281-291},
     zbl = {0992.62039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-26-3-281-291/}
}