@article{MR_1981_24_a16,
     author = {E. Ko\ensuremath{\theta}\ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\eta}-Ko\ensuremath{\lambda}o\ensuremath{\kappa}o\ensuremath{\acute\upsilon}\ensuremath{\rho}\ensuremath{\eta}},
     title = {T\ensuremath{\alpha} {A\ensuremath{\nu}o\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\tau}\ensuremath{\acute\alpha}} {\ensuremath{\Pi}\ensuremath{\rho}o\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\acute\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\alpha}} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\eta} {E\ensuremath{\varphi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\mu}o\ensuremath{\gamma}\ensuremath{\acute\eta}} \ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\tau}o {E\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\kappa}\'{o}} {\ensuremath{\Sigma}\ensuremath{\chi}o\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}o.}},
     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 = {54--73},
     year = {1981},
     volume = {24},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1981_24_a16/}
}