@article{EUG_1989_23_a17,
     author = {\ensuremath{\beta}\ensuremath{\alpha}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\acute\epsilon}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\varsigma} Z\ensuremath{\acute\omega}\ensuremath{\tau}o\ensuremath{\varsigma}},
     title = {O\ensuremath{\iota} {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma}} {O\ensuremath{\lambda}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\acute\alpha}\ensuremath{\delta}\ensuremath{\varepsilon}\ensuremath{\varsigma}} \ensuremath{\sigma}\ensuremath{\acute\eta}\ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\alpha}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {42--50},
     year = {1989},
     volume = {23},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1989_23_a17/}
}