@article{MS2_1960__8_165758,
     author = {Victor Klee},
     title = {Circumspheres and {Inner} {Products.}},
     journal = {Mathematica Scandinavica},
     pages = {363--370},
     publisher = {mathdoc},
     volume = {8},
     year = {1960},
     zbl = {0100.31602},
     url = {http://geodesic.mathdoc.fr/item/MS2_1960__8_165758/}
}