@article{MR_1987__33_a2,
     author = {Hiroko Iguchi and  Makoto Natori and  Hitoshi Imai},
     title = {Reorthoganization in the block {Lanczos} algorithm},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}
},
     pages = {25-39},
     publisher = {mathdoc},
     volume = {33},
     year = {1987},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1987__33_a2/}
}