Towards Machine Learning of Grammars and Compilers of Programming Languages. - Keita Imada; Katsuhiko Nakamura (ECML/PKDD (2), 2008)

Learning Context Free Grammars by Using SAT Solvers. - Keita Imada; Katsuhiko Nakamura (ICMLA, 2009)

Incremental Learning of Cellular Automata for Parallel Recognition of Formal Languages. - Katsuhiko Nakamura; Keita Imada (Discovery Science, 2010)

Search for Minimal and Semi-Minimal Rule Sets in Incremental Learning of Context-Free and Definite Clause Grammars. - Keita Imada; Katsuhiko Nakamura (IEICE Trans. Inf. Syst., 2010)

Towards Incremental Learning of Mildly Context-Sensitive Grammars. - Katsuhiko Nakamura; Keita Imada (ICMLA (1), 2011)

Eliminating Stack Symbols in Push-Down Automata and Linear Indexed Grammars. - Katsuhiko Nakamura; Keita Imada (LATA, 2013)