@article{MR_1992_38_a6,
     author = {T. \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\varsigma} and  O. \ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\omega}\ensuremath{\tau}o\ensuremath{\pi}o\ensuremath{\acute\upsilon}\ensuremath{\lambda}o\ensuremath{\upsilon}},
     title = {\'{}E\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\varsigma} {\ensuremath{\Delta}\ensuremath{\iota}\ensuremath{\delta}\ensuremath{\alpha}\ensuremath{\kappa}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\'{o}\ensuremath{\varsigma}} {\ensuremath{\Pi}\ensuremath{\upsilon}\ensuremath{\gamma}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\omega}\ensuremath{\nu}\ensuremath{\alpha}\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 = {48--68},
     year = {1992},
     volume = {38},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1992_38_a6/}
}