@article{JRAM_1973__261_151337,
     author = {L.D. Loveland and J.E. Valentine},
     title = {Congruent {Embedding} of {Metric} {Quadruples} on a {Unit} {Sphere.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {205--209},
     publisher = {mathdoc},
     volume = {261},
     year = {1973},
     zbl = {0261.52013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__261_151337/}
}