@article{10_4064_am_22_1_91_102,
     author = {Waldemar Popi\'nski},
     title = {On least squares estimation of {Fourier} coefficients and of the regression function},
     journal = {Applicationes Mathematicae},
     pages = {91--102},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1993},
     doi = {10.4064/am-22-1-91-102},
     zbl = {0789.62032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-22-1-91-102/}
}