@article{ZNSL_2002_284_a1,
     author = {A. Yu. Yeremin and A. A. Nikishin},
     title = {Factorized-sparse-approximate-inverse preconditionings of linear systems with unsymmetric matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {18--35},
     year = {2002},
     volume = {284},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_284_a1/}
}