@article{NUMA_1991__59_8_133570,
     author = {A. Elbert},
     title = {An approximation for the zeros of {Bessel} functions.},
     journal = {Numerische Mathematik},
     pages = {647--658},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0760.65020},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133570/}
}