@article{MR_1976_4_a2,
     author = {B. \ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\nu}\ensuremath{\alpha}\ensuremath{\kappa}\'{o}\ensuremath{\pi}o\ensuremath{\upsilon}\ensuremath{\lambda}o\ensuremath{\varsigma} and  \ensuremath{\Delta}. Z\ensuremath{\acute\epsilon}\ensuremath{\rho}\ensuremath{\beta}\ensuremath{\alpha}\ensuremath{\varsigma}},
     title = {\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 = {21--23},
     year = {1976},
     volume = {4},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1976_4_a2/}
}