@article{MR_1980__20_a15,
     author = { },
     title = {\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha} \ensuremath{\beta}\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\mu}o\ensuremath{\acute\upsilon} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\varepsilon}\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\mu}o\ensuremath{\gamma}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma}},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}
},
     pages = {39-90},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1980__20_a15/}
}