@article{wright:1934:aeg,
    author = {Wright, E. M.},
     title = {The asymptotic expansion of the generalized {B}essel
              function},
   journal = {Proc. London Math. Soc. (2)},
    volume = {38},
      year = {1935},
     pages = {257–270},
       doi = {10.1112/plms/s2-38.1.257},
     zblno = {0010.21103}}