@article{MR_1975_3_a159,
     author = {\ensuremath{\Pi}. X\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\varphi}\'{o}\ensuremath{\rho}o\ensuremath{\upsilon}},
     title = {\ensuremath{\Delta}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\beta}\ensuremath{\acute\alpha}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\varepsilon} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\alpha}\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\acute\eta}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\varepsilon}.},
     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 = {15--18},
     year = {1975},
     volume = {3},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_3_a159/}
}