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Doddi, Srinivas; Marathe, Madhav V.; Mirzaian, Andy; Moret, Bernard M. E.; Zhu, Binhai (1997), "Map labeling and its generalizations", Proc. 8th ACM-SIAM Symp. Discrete Algorithms (SODA), Association for Computing Machinery, pp. 148–157, ISBN9780898713909; Formann, M.; Wagner, F. (1991), "A packing problem with applications to lettering of maps", Proc. 7th ACM Symp. Computational Geometry, pp. 281–288; Poon, Chung Keung; Zhu, Binhai; Chin, Francis (1998), "A polynomial time solution for labeling a rectilinear map", Information Processing Letters, 65 (4): 201–207, doi:10.1016/S0020-0190(98)00002-7; Wagner, Frank; Wolff, Alexander (1997), "A practical map labeling algorithm", Computational Geometry: Theory and Applications, 7 (5–6): 387–404, doi:10.1016/S0925-7721(96)00007-7.