@article{DEME_1966_07_B_a7,
     author = {I.\ensuremath{\Theta}. X\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\nu}\ensuremath{\eta}},
     title = {T\ensuremath{\upsilon}\ensuremath{\chi}\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\mu}\ensuremath{\varepsilon} \ensuremath{\tau}\ensuremath{\iota}\ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\gamma}\ensuremath{\varepsilon}\ensuremath{\beta}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\tau}o\ensuremath{\upsilon} {Banach} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\tau}\ensuremath{\upsilon}\ensuremath{\chi}\ensuremath{\alpha}\ensuremath{\acute\iota}o\ensuremath{\iota} \ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\chi}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\mu}o\ensuremath{\acute\iota} \ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\varsigma} \ensuremath{\chi}\ensuremath{\acute\omega}\ensuremath{\rho}o\ensuremath{\upsilon}\ensuremath{\varsigma} \ensuremath{\tau}o\ensuremath{\upsilon} {Hilbert}},
     journal = {\ensuremath{\Delta}\ensuremath{\varepsilon}\ensuremath{\lambda}\ensuremath{\tau}\ensuremath{\acute\iota}o \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} E\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}\ensuremath{\varsigma} M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}\ensuremath{\varsigma} E\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\iota}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha}\ensuremath{\varsigma}},
     pages = {179--218},
     year = {1966},
     volume = {07},
     number = {B},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/DEME_1966_07_B_a7/}
}