@Article{Tar38-68-89,
    Author       = "Tarski, A.",
    Year         = "1938",
    Title        = "{{\"U}ber unerreichbare Kardinalzahlen}",
    Journal      = "Fundamenta Mathematicae",
    Volume       = "30",
    Pages        = "68-89",
    Comment      = "TPTPRef"
}

@Article{Tar38,
    Author       = "Tarski, A.",
    Year         = "1938",
    Title        = "{Ein Beitrag zur Axiomatik der Abelschen Gruppe n}",
    Journal      = "Fundamenta Mathematicae",
    Volume       = "30",
    Pages        = "253-256",
    Comment      = "TPTPRef"
}