@article{MR_1977_7_a18,
     author = {B. \ensuremath{\Pi}o\ensuremath{\lambda}\ensuremath{\upsilon}\ensuremath{\delta}o\ensuremath{\acute\upsilon}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {\ensuremath{\Pi}\ensuremath{\rho}\'{o}\ensuremath{\sigma}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\tau}o \ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\lambda}\ensuremath{\iota}o \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\mu}\ensuremath{\eta}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta}\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 = {3--6},
     year = {1977},
     volume = {7},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_7_a18/}
}