@article{MR_1978_12_a7,
     author = {B. \ensuremath{\Pi}o\ensuremath{\lambda}\ensuremath{\upsilon}\ensuremath{\delta}o\ensuremath{\acute\upsilon}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {T\ensuremath{\iota} \ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\iota} \ensuremath{\tau}\ensuremath{\alpha} \ensuremath{\delta}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\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 = {33--37},
     year = {1978},
     volume = {12},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1978_12_a7/}
}