@article{MR_1974_1_a53,
     author = {K. \ensuremath{\Gamma}. B\ensuremath{\varepsilon}\ensuremath{\rho}\ensuremath{\rho}o\ensuremath{\acute\iota}o\ensuremath{\upsilon}},
     title = {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\chi}\ensuremath{\acute\eta}\ensuremath{\varsigma} {A\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\tau}o\ensuremath{\kappa}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\mu}\'{o}\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 = {54--56},
     year = {1974},
     volume = {1},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1974_1_a53/}
}