@article{EU_1974-1975__04_a6,
     author = {\ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\rho} M\ensuremath{\alpha}\ensuremath{\rho}o\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta}},
     title = {\ensuremath{\Pi}\ensuremath{\upsilon}\ensuremath{\theta}\ensuremath{\alpha}\ensuremath{\gamma}\'{o}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} {H\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varepsilon}\ensuremath{\varsigma}} \ensuremath{\tau}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\acute\alpha}\ensuremath{\delta}\ensuremath{\varepsilon}\ensuremath{\varsigma}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}
},
     pages = {17-23},
     publisher = {mathdoc},
     volume = {04},
     year = {1974-1975},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EU_1974-1975__04_a6/}
}