@article{MR_1981_23_a21,
     author = {N\ensuremath{\acute\iota}\ensuremath{\kappa}o\ensuremath{\varsigma} K\ensuremath{\lambda}\ensuremath{\alpha}o\ensuremath{\upsilon}\ensuremath{\delta}\ensuremath{\acute\alpha}\ensuremath{\tau}o\ensuremath{\varsigma}},
     title = {O\ensuremath{\iota} \ensuremath{\pi}\ensuremath{\rho}\'{o}\ensuremath{\sigma}\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} \ensuremath{\lambda}\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\eta} {\ensuremath{\Pi}\ensuremath{\rho}o\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\acute\alpha}\ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu}} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} \ensuremath{\mu}o\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\lambda}o\ensuremath{\pi}o\ensuremath{\acute\iota}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\tau}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\varepsilon}\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\mu}o\ensuremath{\gamma}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu} {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\omega}\ensuremath{\nu}}},
     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 = {78--93},
     year = {1981},
     volume = {23},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1981_23_a21/}
}