ASAI, T. Efficient Substructure Discovery from Large Semi-Structured Data. Proc. of SIAM Int'l. Conf. on Data Mining. 2002, 158-174
COOK, D. Substructure Discovery Using Minimum Description Length and Background Knowledge. Journal of Artificial Intelligence Research. 1994, 1, 231-255
DE RAEDT, L. The Levelwise Version Space Algorithm and its Application to Molecular Fragment Finding. Proc. of Int'l. Joint Conf. on Artificial Intelligence. 2001, 853-859
GAREY, M. Computers and intractability : a guide to the theory of NP-completeness. 1979