@article{MET_1991__38_2_176342,
     author = {F. Pukelsheim and N.R. Draper and N. Gaffke},
     title = {First and {Second} {Order} {Rotatability} of {Experimental} {Designs,} {Moment} {Matrices,} and {Information} {Surfaces.}},
     journal = {Metrika},
     pages = {129--161},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1991},
     zbl = {0738.62077},
     url = {http://geodesic.mathdoc.fr/item/MET_1991__38_2_176342/}
}