@article{MS2_1976__39_166491,
     author = {Hannu Niemi},
     title = {On the linear prediction problem of certain non-stationary stochastic processes.},
     journal = {Mathematica Scandinavica},
     pages = {146--160},
     publisher = {mathdoc},
     volume = {39},
     year = {1976},
     zbl = {0349.60037},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166491/}
}