@article{MET_1978__25_175736,
     author = {J. Ledolter and G.E.P. Box},
     title = {Conditions for the {Optimality} of {Exponential} {Smoothing} {Forecast} {Procedures.}},
     journal = {Metrika},
     pages = {77--94},
     year = {1978},
     volume = {25},
     zbl = {0377.62057},
     url = {http://geodesic.mathdoc.fr/item/MET_1978__25_175736/}
}