@article{MR_1980_17_a16,
     author = {T\ensuremath{\acute\alpha}\ensuremath{\kappa}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\ddot\iota}\ensuremath{\omega}\ensuremath{\acute\alpha}\ensuremath{\nu}\ensuremath{\nu}o\ensuremath{\upsilon}},
     title = {\ensuremath{\Theta}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha} {\ensuremath{\Delta}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\gamma}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}o\ensuremath{\lambda}\ensuremath{\eta}\ensuremath{\psi}\ensuremath{\acute\iota}\ensuremath{\alpha}\ensuremath{\varsigma}} {A\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\kappa}\'{o}\ensuremath{\pi}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\sigma}\ensuremath{\acute\upsilon}\ensuremath{\gamma}\ensuremath{\chi}\ensuremath{\rho}o\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\varsigma} {K\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\upsilon}\ensuremath{\theta}\ensuremath{\acute\upsilon}\ensuremath{\nu}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\iota}\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 = {84--99},
     year = {1980},
     volume = {17},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1980_17_a16/}
}