@article{EUG_1996_45_a23,
     author = {K\ensuremath{\alpha}\ensuremath{\varphi}o\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\Sigma}\'{o}\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\alpha} and  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 = {\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{\Pi}\ensuremath{\rho}\'{o}\ensuremath{\sigma}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} {A\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}:} {O\ensuremath{\iota}} {\ensuremath{\Delta}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\tau}\'{o}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\varsigma}} \ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu} \ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\iota}\ensuremath{\delta}\ensuremath{\iota}\ensuremath{\acute\omega}\ensuremath{\nu} \'{o}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\nu} \ensuremath{\acute\epsilon}\ensuremath{\rho}\ensuremath{\chi}o\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\sigma}\ensuremath{\tau}o {\ensuremath{\Delta}\ensuremath{\eta}\ensuremath{\mu}o\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\'{o}} {\ensuremath{\Sigma}\ensuremath{\chi}o\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}o}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {54--66},
     year = {1996},
     volume = {45},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1996_45_a23/}
}