@article{MR_1977_5_a47,
     author = {A\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\sigma}\ensuremath{\iota}o\ensuremath{\varsigma} \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\varsigma} and  K\ensuremath{\alpha}\ensuremath{\sigma}o\ensuremath{\kappa}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta} M\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha} and  A\ensuremath{\nu}\ensuremath{\delta}\ensuremath{\rho}\ensuremath{\acute\epsilon}\ensuremath{\alpha}\ensuremath{\varsigma} T\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\varphi}\ensuremath{\acute\upsilon}\ensuremath{\lambda}\ensuremath{\lambda}o\ensuremath{\upsilon} and  \ensuremath{\Theta}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\acute\alpha}\ensuremath{\varsigma} \ensuremath{\Pi}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\varphi}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} and  X\ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\kappa}o\ensuremath{\acute\upsilon} B\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\iota}\ensuremath{\lambda}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}},
     title = {\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\eta} {B΄T\ensuremath{\acute\alpha}\ensuremath{\xi}\ensuremath{\eta}.} {\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha}} \ensuremath{\tau}\ensuremath{\iota}\ensuremath{\varsigma} {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\acute\eta}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma}.} {O\ensuremath{\mu}o\ensuremath{\iota}\'{o}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\alpha}.}},
     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 = {138--146},
     year = {1977},
     volume = {5},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_5_a47/}
}