@article{EUG_1987__14_a19,
     author = { },
     title = {EK\ensuremath{\Theta}E\ensuremath{\Sigma}H {\ensuremath{\Pi}E\ensuremath{\Pi}PA\ensuremath{\Gamma}MEN\ensuremath{\Omega}N} {ETO\ensuremath{\Upsilon}\ensuremath{\Sigma}} 1973},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}
},
     pages = {200-213},
     publisher = {mathdoc},
     volume = {14},
     year = {1987},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1987__14_a19/}
}