@article{JRAM_1863__61_147873,
     author = {George Boole},
     title = {Ueber die partielle {Differentialgleichung} zweiter {Ordnung} {Rr+Ss+Tt+U(s2-rt)=V.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {309--333},
     publisher = {mathdoc},
     volume = {61},
     year = {1863},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1863__61_147873/}
}