@article{MR_1975_2_a36,
     author = {A. N. \ensuremath{\Phi}\ensuremath{\iota}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\pi}\ensuremath{\pi}o\ensuremath{\upsilon}},
     title = {\ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\iota}\ensuremath{\gamma}\ensuremath{\nu}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\iota}\ensuremath{\alpha} {T\ensuremath{\acute\upsilon}\ensuremath{\chi}\ensuremath{\eta}\ensuremath{\varsigma}.} {H} \ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\chi}\ensuremath{\acute\eta} \ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\iota} o\ensuremath{\iota} \ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} {\ensuremath{\Pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\alpha}\ensuremath{\nu}o\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\omega}\ensuremath{\rho}\ensuremath{\acute\iota}\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 = {63--72},
     year = {1975},
     volume = {2},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_2_a36/}
}