@article{MR_1977_5_a35,
     author = {\ensuremath{\Sigma}. \ensuremath{\Phi}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\acute\iota}\ensuremath{\nu}o\ensuremath{\varsigma} and  N. \ensuremath{\Pi}\ensuremath{\rho}\ensuremath{\omega}\ensuremath{\tau}o\ensuremath{\acute\upsilon}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\varsigma} and  \ensuremath{\Lambda}. \ensuremath{\Sigma}\ensuremath{\mu}\ensuremath{\upsilon}\ensuremath{\rho}\ensuremath{\nu}\ensuremath{\acute\eta}\ensuremath{\varsigma} and  N. \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\xi}\ensuremath{\iota}\ensuremath{\nu}\'{o}\ensuremath{\varsigma}},
     title = {---\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu} {\ensuremath{\Sigma}T΄} \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 = {55--72},
     year = {1977},
     volume = {5},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_5_a35/}
}