@article{EU_1973-1974__06_a0,
     author = { },
     title = {\ensuremath{\Lambda}\ensuremath{\acute\upsilon}\ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\varsigma}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}
},
     pages = {51-54},
     publisher = {mathdoc},
     volume = {06},
     year = {1973-1974},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EU_1973-1974__06_a0/}
}