@article{MR_1989_36_a13,
     author = {E. T\ensuremath{\sigma}\ensuremath{\iota}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\varsigma}},
     title = {E\ensuremath{\kappa}\ensuremath{\tau}\ensuremath{\acute\iota}\ensuremath{\mu}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\gamma}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\alpha}\ensuremath{\nu}o\ensuremath{\varphi}\ensuremath{\acute\alpha}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\varsigma} \ensuremath{\gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\lambda}o\ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\acute\omega}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\kappa}o\ensuremath{\iota}\ensuremath{\nu}\ensuremath{\omega}\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\delta}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\delta}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma}.},
     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 = {45--60},
     year = {1989},
     volume = {36},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1989_36_a13/}
}