@article{MR_1975_2_a44,
     author = { },
     title = {\ensuremath{\Pi}\ensuremath{\upsilon}\ensuremath{\theta}\ensuremath{\alpha}\ensuremath{\gamma}\'{o}\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\varsigma} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} {\ensuremath{\Pi}\ensuremath{\upsilon}\ensuremath{\theta}\ensuremath{\alpha}\ensuremath{\gamma}\'{o}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\iota}o\ensuremath{\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 = {43},
     year = {1975},
     volume = {2},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_2_a44/}
}