@article{MR_1978_9_a8,
     author = {\ensuremath{\Gamma}. \ensuremath{\Theta}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\alpha}\acute{\ddot{\iota}}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {H \ensuremath{\delta}\ensuremath{\iota}\ensuremath{\delta}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\alpha} \ensuremath{\varepsilon}\ensuremath{\nu}\ensuremath{\nu}o\ensuremath{\iota}\ensuremath{\acute\omega}\ensuremath{\nu} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} {A\ensuremath{\nu}\ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}} \ensuremath{\mu}\ensuremath{\varepsilon} o\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\gamma}\'{o} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu} {I\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}} \ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\acute\epsilon}\ensuremath{\lambda}\ensuremath{\iota}\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 = {8--22},
     year = {1978},
     volume = {9},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1978_9_a8/}
}