@article{EUG_1993_38_a22,
     author = {A. Kontolatou},
     title = {Approximation {Theorems} for ordered groups with quasi-divisors {Theory}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {137--143},
     year = {1993},
     volume = {38},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1993_38_a22/}
}