@article{Amos:1990:AEC,
author = {Amos, Donald E.},
title = {Algorithm 683: {A} portable {FORTRAN} subroutine for exponential
integrals of a complex argument},
journal = {ACM Trans. Math. Software},
fjournal = {Association for Computing Machinery. Transactions on
Mathematical Software},
volume = {16},
year = {1990},
number = {2},
pages = {178–182},
note = {Double- and single-precision Fortran, maximum accuracy 18S or 14S.},
issn = {0098-3500},
coden = {ACMSCU},
mrclass = {65D20 (65Y10)},
mrnumber = {MR1158087 (92k:65026)},
doi = {10.1145/78928.78934},
links = {\GAMSmodule{TOMS}{683}{8725}},
zblno = {0900.65029}}