@masterthesis{2882475, title = "Elliptic Systems with Variational Structure", authorField = "Γαζούλης, Δημήτριος", year = "2019", school = "ΠΜΣ Μαθηματικά, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών" }