@article{MR_1981__24_a15,
     author = {K. \ensuremath{\Sigma}o\ensuremath{\upsilon}\ensuremath{\rho}\ensuremath{\lambda}\ensuremath{\acute\alpha}\ensuremath{\varsigma} and  \'{}A\ensuremath{\nu}\ensuremath{\nu}\ensuremath{\alpha} \ensuremath{\Pi}\ensuremath{\acute\epsilon}\ensuremath{\tau}\ensuremath{\tau}\ensuremath{\alpha} and  K. K\ensuremath{\omega}\ensuremath{\nu}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\lambda}\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta}},
     title = {\ensuremath{\Sigma}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma} {\ensuremath{\Delta}\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\rho}\ensuremath{\iota}\'{o}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\varsigma}} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} {B΄} {\ensuremath{\Gamma}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}o\ensuremath{\upsilon}.}},
     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 = {44-53},
     publisher = {mathdoc},
     volume = {24},
     year = {1981},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1981__24_a15/}
}