@article{MR_1975_2_a68,
     author = {Ko\ensuremath{\upsilon}\ensuremath{\rho}\ensuremath{\kappa}o\ensuremath{\upsilon}\ensuremath{\rho}\ensuremath{\acute\eta}\ensuremath{\varsigma} N. and  \ensuremath{\Sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\varsigma} N.},
     title = {\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu}- {A΄} \ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\xi}\ensuremath{\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 = {20--23},
     year = {1975},
     volume = {2},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_2_a68/}
}