@article{MR_1977_6_a20,
     author = {\ensuremath{\Gamma}. M\ensuremath{\varepsilon}\ensuremath{\nu}\ensuremath{\delta}\ensuremath{\omega}\ensuremath{\nu}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {T\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\alpha}\ensuremath{\pi}\'{o} \ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\varsigma} \ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\chi}\ensuremath{\alpha}\ensuremath{\acute\iota}o\ensuremath{\upsilon}\ensuremath{\varsigma} {\'{}E\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\varsigma}} {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}o\ensuremath{\acute\upsilon}\ensuremath{\varsigma}}},
     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 = {3--4},
     year = {1977},
     volume = {6},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_6_a20/}
}