@article{MR_1978_9_a21,
     author = {\ensuremath{\Sigma}. Ko\ensuremath{\lambda}\ensuremath{\upsilon}\ensuremath{\beta}\ensuremath{\acute\alpha}\ensuremath{\varsigma}},
     title = {\'{}Y\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\xi}\ensuremath{\eta} \ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\mu}\ensuremath{\acute\omega}\ensuremath{\nu} \ensuremath{\pi}o\ensuremath{\upsilon} \ensuremath{\delta}\ensuremath{\varepsilon}\ensuremath{\nu} \ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\rho}\ensuremath{\eta}\ensuremath{\tau}o\ensuremath{\acute\iota}},
     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--30},
     year = {1978},
     volume = {9},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1978_9_a21/}
}