@article{10_4064_am_27_3_309_318,
     author = {Waldemar Popi\'nski},
     title = {Orthogonal series regression estimators for an irregularly spaced design},
     journal = {Applicationes Mathematicae},
     pages = {309--318},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {2000},
     doi = {10.4064/am-27-3-309-318},
     zbl = {0990.62033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-27-3-309-318/}
}