On the limitation of the global time assumption in distributed systems (extended abstract) - Abraham, Uri; Ben-David, Shai; Moran, Shlomo (haṭ- Ṭeḵniyyôn, Māḵôn Ṭeḵnôlôgî le-Yiśrā'ēl <Ḥêfā> / Department of Computer Science: Technical report, 1991)