@article{EUG_1987_17_a25,
     author = {M\ensuremath{\pi}\ensuremath{\acute\iota}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\rho} \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\kappa}\ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\varphi}},
     title = {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} {E\ensuremath{\xi}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\acute\omega}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma}}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {60--64},
     year = {1987},
     volume = {17},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1987_17_a25/}
}