@article{10_4064_am_26_2_121_131,
     author = {Waldemar Popi\'nski},
     title = {Least-squares trigonometric regression estimation},
     journal = {Applicationes Mathematicae},
     pages = {121--131},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1999},
     doi = {10.4064/am-26-2-121-131},
     zbl = {0992.62037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-26-2-121-131/}
}