@article{MAN_1893__43_157674,
     author = {J.H. Graf},
     title = {Ueber die {Addition} und {Subtraction} der {Argumente} bei {Bessel'schen} {Functionen} nebst einer {Anwendung}},
     journal = {Mathematische Annalen},
     pages = {136--144},
     publisher = {mathdoc},
     volume = {43},
     year = {1893},
     zbl = {25.0844.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1893__43_157674/}
}