@article{olver:1997:asl,
    author = {Olver, F. W. J.},
     title = {Asymptotic solutions of linear ordinary differential equations
              at an irregular singularity of rank unity},
   journal = {Methods Appl. Anal.},
  fjournal = {Methods and Applications of Analysis},
    volume = {4},
      year = {1997},
    number = {4},
     pages = {375–403},
      issn = {1073-2772},
   mrclass = {34E05 (34A20)},
  mrnumber = {MR1605622 (99c:34117)},
mrreviewer = {A. D. Wood},
     zblno = {0896.34049}}