Covering polygons with squares - Bar-Yehuda, Reuven; Ben-Chanoch, Eyal (haṭ- Ṭeḵniyyôn, Māḵôn Ṭeḵnôlôgî le-Yiśrā'ēl <Ḥêfā> / Department of Computer Science: Technical report, 1989)