@article{MR_1987__32_a1,
     author = {A. \ensuremath{\Pi}o\ensuremath{\acute\upsilon}\ensuremath{\lambda}o\ensuremath{\varsigma}},
     title = {\ensuremath{\Pi}\ensuremath{\rho}o\ensuremath{\beta}o\ensuremath{\lambda}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} {\ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}} {\ensuremath{\Gamma}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha}} {(M\ensuremath{\iota}\ensuremath{\alpha}} \ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\delta}\ensuremath{\rho}o\ensuremath{\mu}\ensuremath{\acute\eta} \ensuremath{\sigma}\ensuremath{\varepsilon} \ensuremath{\pi}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\alpha} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\gamma}\ensuremath{\acute\epsilon}\ensuremath{\nu}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\tau}o\ensuremath{\upsilon}\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 = {13-22},
     publisher = {mathdoc},
     volume = {32},
     year = {1987},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1987__32_a1/}
}