@article{ERAAMS_1999_05_a2,
     author = {Rivin, Igor and Schlenker, Jean-Marc},
     title = {The {Schl\"afli} formula in {Einstein} manifolds with boundary},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {18--23},
     publisher = {mathdoc},
     volume = {05},
     year = {1999},
     doi = {10.1090/S1079-6762-99-00057-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-99-00057-8/}
}