@article{MR_1977_6_a2,
     author = {K. T\ensuremath{\sigma}o\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\acute\alpha}\ensuremath{\varsigma}},
     title = {O {Ko\ensuremath{\iota}\ensuremath{\nu}\ensuremath{\omega}\ensuremath{\nu}\ensuremath{\iota}\ensuremath{\kappa}\'{o}\ensuremath{\varsigma}} \ensuremath{\rho}\'{o}\ensuremath{\lambda}o\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\sigma} {E\ensuremath{\kappa}\ensuremath{\pi}\ensuremath{\alpha}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\varepsilon}\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\eta}\ensuremath{\varsigma}} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} {N\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\eta}} {E\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\acute\alpha}\ensuremath{\delta}\ensuremath{\alpha}}},
     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--74},
     year = {1977},
     volume = {6},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_6_a2/}
}