@article{MS2_1960__8_165750,
     author = {A. Tengstrand},
     title = {Distributions {Invariant} under an {Orthogonal} {Group} of {Arbitrary} {Signature.}},
     journal = {Mathematica Scandinavica},
     pages = {201--218},
     publisher = {mathdoc},
     volume = {8},
     year = {1960},
     zbl = {0104.33402},
     url = {http://geodesic.mathdoc.fr/item/MS2_1960__8_165750/}
}