@article{EU_1973-1974_01_a12,
     author = {T. \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\varsigma} and  A. T\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\varphi}\ensuremath{\acute\upsilon}\ensuremath{\lambda}\ensuremath{\lambda}o\ensuremath{\upsilon} and  K\ensuremath{\alpha}\ensuremath{\sigma}o\ensuremath{\kappa}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta} M. and  \ensuremath{\Theta}. \ensuremath{\Pi}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\varphi}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu}-- {B} \ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\xi}\ensuremath{\eta}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}},
     pages = {13--20},
     year = {1973-1974},
     volume = {01},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EU_1973-1974_01_a12/}
}