1. M. Boraie and A. Balghonaim, “Optical recognition of electrical circuit drawings,” in Proc. IEEE Pacific Rim Conf. on Networking the Pacific Rim (1997), Vol. 2, pp. 843–846.
2. K. Broelemann, A. Dutta, X. Jiang, and J. Lladós, “Hierarchical graph representation for symbol spotting in graphical document images,” in Proc. SSPR/SPR (Hiroshima, 2012), pp. 529–538.
3. R. Cardoner and F. Thomas, “Efficient morphological set transformations on line drawings,” Int. J. Pattern Recogn. Artficial Intellig. 11 (6), 947–959 (1997).
4. J. Chen, M. K. Leung, and Y. Gao, “Noisy logo recognition using line segment Hausdorff distance,” Pattern Recogn. 36 (4), 943–955 (2003).
5. T. Cheng, J. Khan, H. Liu, and D. Yun, “A symbol recognition system,” in Proc. 2nd Int. Conf. on Document Analysis and Recognition, ICDAR’93 (Tsukuba, 1993), pp. 918–921.