@article{MR_1989_36_a11,
     author = {B\ensuremath{\alpha}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\acute\epsilon}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\varsigma} N\ensuremath{\tau}\ensuremath{\zeta}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\chi}\ensuremath{\rho}\ensuremath{\acute\eta}\ensuremath{\sigma}\ensuremath{\tau}o\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{\tau}\ensuremath{\eta}\ensuremath{\varsigma} {\ensuremath{\Gamma}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha}\ensuremath{\varsigma}} {(\ensuremath{\Delta}\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\kappa}o\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma}} \ensuremath{\mu}\ensuremath{\acute\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma} - {A\ensuremath{\nu}\ensuremath{\acute\alpha}\ensuremath{\pi}\ensuremath{\tau}\ensuremath{\upsilon}\ensuremath{\xi}\ensuremath{\eta}} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\gamma}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\psi}\ensuremath{\eta}\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 = {25--36},
     year = {1989},
     volume = {36},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1989_36_a11/}
}