@article{EUG_1989_21_a12,
     author = {\ensuremath{\Gamma}. \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\delta}\ensuremath{\acute\alpha}\ensuremath{\tau}o\ensuremath{\varsigma} and  M\ensuremath{\iota}\ensuremath{\chi}\ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\varsigma}. K. K\ensuremath{\omega}\ensuremath{\beta}\ensuremath{\alpha}\ensuremath{\acute\iota}o\ensuremath{\varsigma}},
     title = {A\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} {\ensuremath{\Pi}\ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\alpha}\ensuremath{\varsigma}}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {4--13},
     year = {1989},
     volume = {21},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1989_21_a12/}
}