@article{MM_2008_20_1_a6,
     author = {N. N. Kalitkin and I. A. Panin},
     title = {On the exponential integral computation},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {87--91},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_2008_20_1_a6/}
}