@article{Bogush:1997:POT,
author = {Bogush, A. A. and Otchik, V. S.},
title = {Problem of two {C}oulomb centres at large intercentre
separation: Asymptotic expansions from analytical solutions of
the {H}eun equation},
journal = {J. Phys. A},
fjournal = {Journal of Physics. A. Mathematical and General},
volume = {30},
year = {1997},
number = {2},
pages = {559–571},
issn = {0305-4470},
coden = {JPHAC5},
mrclass = {81V55 (33C90)},
mrnumber = {MR1442876 (98f:81376)},
doi = {10.1088/0305-4470/30/2/019},
zblno = {0960.81075}}