@article{MET_1961__4_175115,
     author = {R. Wartmann},
     title = {Trendextrapolation bei {Zeitreihen.}},
     journal = {Metrika},
     pages = {237--246},
     publisher = {mathdoc},
     volume = {4},
     year = {1961},
     zbl = {0107.13902},
     url = {http://geodesic.mathdoc.fr/item/MET_1961__4_175115/}
}