@article{MR_1980_18_a6,
     author = {K. Z\ensuremath{\acute\omega}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {H {A\ensuremath{\xi}\ensuremath{\iota}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}} {M\ensuremath{\acute\epsilon}\ensuremath{\theta}o\ensuremath{\delta}o\ensuremath{\varsigma}} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} {\ensuremath{\Gamma}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\iota}\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 = {6--15},
     year = {1980},
     volume = {18},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1980_18_a6/}
}