@article{10_21136_AM_1996_134311,
     author = {Z{\'\i}tko, Jan},
     title = {Combining the preconditioned conjugate gradient method and a matrix iterative method},
     journal = {Applications of Mathematics},
     pages = {19--39},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1996},
     doi = {10.21136/AM.1996.134311},
     mrnumber = {1365137},
     zbl = {0847.65016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1996.134311/}
}