@article{10_2307_121078,
     author = {S. Alesker},
     title = {Continuous rotation invariant valuations on convex sets},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {3},
     doi = {10.2307/121078},
     zbl = {0941.52002},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121078/}
}