@article{10_21136_AM_1984_104074,
     author = {Pokrzywa, Andrzej},
     title = {Spectral approximation of positive operators by iteration subspace method},
     journal = {Applications of Mathematics},
     pages = {104--113},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1984},
     doi = {10.21136/AM.1984.104074},
     mrnumber = {0738496},
     zbl = {0562.65036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1984.104074/}
}