@article{JRAM_1891__107_148797,
     author = {F. Caspary},
     title = {Sur quelques formules relatives aux fonctions sph\'eriques. {(Extrait} d'une lettre adress\'ee \`a {M.} {Ch.} {Hermite} \`a {Paris} par {M.} {F.} {Caspary).}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {137--140},
     publisher = {mathdoc},
     volume = {107},
     year = {1891},
     zbl = {22.0506.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1891__107_148797/}
}