1DIJK S V, KREVELD M V, et al. Towards an Evaluation of Quality for Label Placement Methods[ A].Proceedings of the 19th International Cartographic Conference (ICA' 99) [ C]. Ottawa: Int Cartographic Association, 1999. 905-913.
2YOELI P. The Logic of Automated Map Lettering [J]. The Cartographic Journal, 1972, (9):99-108.
