@article{russell:1909:eri,
    author = {Russell, A.},
     title = {The effective resistance and inductance of a concentric
              main, and methods of computing the $\mathrm{ber}$ and $\mathrm{bei}$
              and allied functions},
   journal = {Philos. Mag. (6)},
    volume = {17},
      year = {1909},
     pages = {524–552},
       doi = {10.1088/1478-7814/21/1/339},
     zblno = {40.0951.02}}