@misc{JDM_1894__3_144443,
     title = {A. {G.} {Green} (1828); {C.F.} {Gauss} (1840); {P.G.} {Lejeune-Dirichlet;} {G.} {Kirchhoff} (1845-1848); {H.} {Helmholtz} (1853).},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {249--256},
     publisher = {mathdoc},
     volume = {3},
     year = {1894},
     url = {http://geodesic.mathdoc.fr/item/JDM_1894__3_144443/}
}