@article{Davies:1973:CZL,
author = {Davies, B.},
title = {Complex zeros of linear combinations of spherical {B}essel
functions and their derivatives},
journal = {SIAM J. Math. Anal.},
fjournal = {SIAM Journal on Mathematical Analysis},
volume = {4},
year = {1973},
pages = {128–133},
number = {1},
issn = {1095-7154},
mrclass = {33A40},
mrnumber = {MR0328154 (48 \#6496)},
mrreviewer = {C. J. Bouwkamp},
doi = {10.1137/0504014},
zblno = {0223.33013}}