@article{EUG_1987__14_a4,
     author = {P. Strantzalos},
     title = {Semieffektive und {D-Minimale} {Aktionen}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}
},
     pages = {25-32},
     publisher = {mathdoc},
     volume = {14},
     year = {1987},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1987__14_a4/}
}