@article{MR_1974_1_a107,
     author = {\ensuremath{\Pi}. X\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\varphi}\'{o}\ensuremath{\rho}o\ensuremath{\upsilon} and  \ensuremath{\Theta}. O\ensuremath{\iota}\ensuremath{\kappa}o\ensuremath{\nu}o\ensuremath{\mu}\'{o}\ensuremath{\pi}o\ensuremath{\upsilon}\ensuremath{\lambda}o\ensuremath{\varsigma} and  B. B\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\delta}o\ensuremath{\upsilon}\ensuremath{\rho}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\acute\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\alpha} \ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\theta}\ensuremath{\mu}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}\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 = {9--11},
     year = {1974},
     volume = {1},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1974_1_a107/}
}