@article{MR_1989_36_a8,
     author = {N. A\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\xi}\ensuremath{\alpha}\ensuremath{\nu}\ensuremath{\delta}\ensuremath{\rho}\ensuremath{\acute\eta}\ensuremath{\varsigma} and  MVD Burmester and  B. X\ensuremath{\rho}\ensuremath{\upsilon}\ensuremath{\sigma}\ensuremath{\iota}\ensuremath{\kappa}\'{o}\ensuremath{\pi}o\ensuremath{\upsilon}\ensuremath{\lambda}o\ensuremath{\varsigma}},
     title = {\ensuremath{\Sigma}\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha} \ensuremath{\varepsilon}\ensuremath{\lambda}\ensuremath{\acute\alpha}\ensuremath{\chi}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\gamma}\ensuremath{\nu}\ensuremath{\acute\omega}\ensuremath{\sigma}\ensuremath{\eta}\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 = {1--8},
     year = {1989},
     volume = {36},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1989_36_a8/}
}