@article{EUG_1987_14_a30,
     author = {T\ensuremath{\acute\alpha}\ensuremath{\sigma}o\ensuremath{\varsigma} \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {E\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu} {E\ensuremath{\kappa}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}} {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\acute\alpha}\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}} \ensuremath{\mu}\ensuremath{\varepsilon} {\ensuremath{\Delta}\ensuremath{\varepsilon}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\acute\alpha}\ensuremath{\chi}\ensuremath{\rho}o\ensuremath{\nu}o\ensuremath{\upsilon}\ensuremath{\varsigma}.}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {17--33},
     year = {1987},
     volume = {14},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1987_14_a30/}
}