@article{EUA_1989-1990_3_a105,
     author = {\ensuremath{\Theta}. \ensuremath{\Gamma}\ensuremath{\iota}o\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {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} A},
     pages = {23--24},
     year = {1989-1990},
     volume = {3},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUA_1989-1990_3_a105/}
}