@article{MR_1977_8_a26,
     author = {A \ensuremath{\Gamma}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}o\ensuremath{\upsilon} and  B \ensuremath{\Gamma}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}o\ensuremath{\upsilon} and  \ensuremath{\Gamma} \ensuremath{\Gamma}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}o\ensuremath{\upsilon}},
     title = {A\ensuremath{\varphi}\ensuremath{\iota}\ensuremath{\acute\epsilon}\ensuremath{\rho}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\alpha} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma} \ensuremath{\tau}o\ensuremath{\upsilon} {\ensuremath{\Gamma}\ensuremath{\upsilon}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\acute\iota}o\ensuremath{\upsilon}}},
     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 = {22--41},
     year = {1977},
     volume = {8},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1977_8_a26/}
}