@article{MR_2003__60_a1,
     author = {B. Z\ensuremath{\acute\alpha}\ensuremath{\nu}o\ensuremath{\upsilon}},
     title = {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\acute\alpha}\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta} {E\ensuremath{\lambda}\ensuremath{\alpha}\ensuremath{\chi}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\pi}o\ensuremath{\acute\iota}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}} {K\'{o}\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\varsigma}} \ensuremath{\gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}o\ensuremath{\nu} {\'{}E\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\gamma}\ensuremath{\chi}o} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} {P\ensuremath{\acute\upsilon}\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}} \ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu} {\ensuremath{\Upsilon}\ensuremath{\delta}\ensuremath{\acute\alpha}\ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu}} {-K\ensuremath{\alpha}\ensuremath{\theta}o\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\mu}\'{o}\ensuremath{\varsigma}} {M\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\acute\omega}\ensuremath{\nu}} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\acute\omega}\ensuremath{\nu}} {E\ensuremath{\pi}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\sigma}\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 = {20-30},
     publisher = {mathdoc},
     volume = {60},
     year = {2003},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_2003__60_a1/}
}