@article{MET_1995__42_3-4_176551,
     author = {Norbert Gaffke and Berthold Heiligers},
     title = {Optimal and {Robust} {Invariant} {Designs} for {Cubic} {Multiple} {Regression.}},
     journal = {Metrika},
     pages = {29--48},
     publisher = {mathdoc},
     volume = {42},
     number = {3-4},
     year = {1995},
     zbl = {0817.62059},
     url = {http://geodesic.mathdoc.fr/item/MET_1995__42_3-4_176551/}
}