@article{MR_1975_3_a89,
     author = {\ensuremath{\Delta}. K\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\tau}\ensuremath{\zeta}\ensuremath{\iota}\'{o}\ensuremath{\varsigma} and  K. M\ensuremath{\pi}\ensuremath{\rho}o\ensuremath{\upsilon}\ensuremath{\chi}o\ensuremath{\acute\upsilon}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\varsigma}},
     title = {\ensuremath{\Gamma}\ensuremath{\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\eta}\ensuremath{\nu} {\ensuremath{\Delta}΄} \ensuremath{\tau}\ensuremath{\acute\alpha}\ensuremath{\xi}\ensuremath{\eta}-},
     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 = {41--61},
     year = {1975},
     volume = {3},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1975_3_a89/}
}