@article{JRAM_1967__226_150791,
     author = {Harold Ruben},
     title = {An intrinsic formula for volume.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {116--119},
     publisher = {mathdoc},
     volume = {226},
     year = {1967},
     zbl = {0166.06103},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1967__226_150791/}
}