@article{MR_1986__31_a10,
     author = {T. \ensuremath{\Pi}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\acute\omega}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\varsigma} and  \ensuremath{\Delta}. Z\ensuremath{\alpha}\ensuremath{\chi}\ensuremath{\alpha}\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\acute\alpha}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}},
     title = {H {I\ensuremath{\sigma}\ensuremath{\tau}o\ensuremath{\rho}\ensuremath{\acute\iota}\ensuremath{\alpha}} \ensuremath{\varepsilon}\ensuremath{\nu}\'{o}\ensuremath{\varsigma} \ensuremath{\pi}\ensuremath{\rho}o\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\acute\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}o\ensuremath{\varsigma} \ensuremath{\pi}o\ensuremath{\upsilon} ... \ensuremath{\mu}\ensuremath{\varepsilon}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\rho}\ensuremath{\varepsilon}\ensuremath{\pi}\'{o}\ensuremath{\tau}\ensuremath{\alpha}\ensuremath{\nu} \ensuremath{\sigma}\ensuremath{\varepsilon} \ensuremath{\acute\alpha}\ensuremath{\lambda}\ensuremath{\lambda}\ensuremath{\alpha} \ensuremath{\alpha}\ensuremath{\pi}\ensuremath{\lambda}o\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\rho}\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 = {18-22},
     publisher = {mathdoc},
     volume = {31},
     year = {1986},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1986__31_a10/}
}