@article{EUG_1990_26_a20,
     author = {N\ensuremath{\iota}\ensuremath{\kappa}\'{o}\ensuremath{\lambda}\ensuremath{\alpha}o\ensuremath{\varsigma} K. A\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\mu}\ensuremath{\iota}\ensuremath{\acute\alpha}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {Ko\ensuremath{\rho}\ensuremath{\upsilon}\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\gamma}\ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\alpha} {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\alpha}.}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {18--27},
     year = {1990},
     volume = {26},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1990_26_a20/}
}