 The Oxford Classical Text series has been used for citation of most classical texts. Other editions of reference for many texts include the series published respectively by Teubner in Germany and by Budé in France. Abbreviations are used for the following texts and translations: DK: For the Presocratics: Diels, H., and W. Kranz (eds.), 1951–2, Die Fragmente der Vorsokratiker, griechisch und deutsch, 6th edn, 3 vols., Berlin: Weidmann. SVF: For the Stoics: von Arnim, Hans von, 1903–21, Stoicorum Veterum Fragmenta, 4 vols., Leipzig: B.G. Teubner. LS: For translations of the Stoics: Long, A. A., and D. N. Sedley (eds.), 1987, The Hellenistic Philosophers, 2 vols. Cambridge: Cambridge University Press [Greek and Latin texts in vol.2], which is abbreviated LS in the body of this entry.