@article{MR_1975_2_a25,
     author = {\ensuremath{\Lambda}. \ensuremath{\Sigma}\ensuremath{\acute\epsilon}\ensuremath{\rho}\ensuremath{\gamma}\ensuremath{\eta} and  M. T\ensuremath{\sigma}\ensuremath{\alpha}\ensuremath{\kappa}\ensuremath{\iota}\ensuremath{\rho}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta}},
     title = {H \ensuremath{\pi}\ensuremath{\rho}\'{o}\ensuremath{\gamma}\ensuremath{\nu}\ensuremath{\omega}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\tau}o\ensuremath{\upsilon} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota}\ensuremath{\rho}o\ensuremath{\acute\upsilon} \ensuremath{\mu}\ensuremath{\varepsilon} \ensuremath{\eta}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\kappa}\ensuremath{\tau}\ensuremath{\rho}o\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\kappa}\'{o} \ensuremath{\upsilon}\ensuremath{\pi}o\ensuremath{\lambda}o\ensuremath{\gamma}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\acute\eta}},
     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 = {1975},
     volume = {2},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_2_a25/}
}