@article{EU_1973-1974__07_a1,
     author = {E. \ensuremath{\Sigma}. \ensuremath{\Sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\mu}\ensuremath{\acute\alpha}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {\ensuremath{\Theta}\ensuremath{\varepsilon}\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\tau}o\ensuremath{\varsigma} o {A\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\acute\iota}o\ensuremath{\varsigma}}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}
},
     pages = {12-14},
     publisher = {mathdoc},
     volume = {07},
     year = {1973-1974},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EU_1973-1974__07_a1/}
}