1. Bounded degree graphs can have arbitrarily large slope number;Pach;Electron. J. Combin.,2006
2. Bounded degree graphs have arbitrarily large geometric thickness;Barát;Electron. J. Combin.,2006
3. Drawing cubic graphs with at most five slopes;Keszegh,2007
4. B. Keszegh, J. Pach, D. Pálvölgyi, G. Tóth, The slope parameter of cubic graphs is bounded, Manuscript
5. M. Engelstein, Drawing graphs with few slopes, Research paper submitted to the Intel Competition for high school students, New York, October 2005