Niemi, Valtteri Power languages and density. (English) Zbl 0737.68054 Discrete Appl. Math. 32, No. 2, 183-193 (1991). Reviewer: C.Reutenauer (Montreal) MSC: 68Q45 PDFBibTeX XMLCite \textit{V. Niemi}, Discrete Appl. Math. 32, No. 2, 183--193 (1991; Zbl 0737.68054) Full Text: DOI
Niemi, Valtteri Density of grammar forms. II. (English) Zbl 0655.68099 Int. J. Comput. Math. 20, No. 2, 91-114 (1986). MSC: 68Q45 68Q42 PDFBibTeX XMLCite \textit{V. Niemi}, Int. J. Comput. Math. 20, No. 2, 91--114 (1986; Zbl 0655.68099) Full Text: DOI
Niemi, Valtteri Density of grammar forms. I. (English) Zbl 0655.68098 Int. J. Comput. Math. 20, No. 1, 3-21 (1986). MSC: 68Q45 68Q42 PDFBibTeX XMLCite \textit{V. Niemi}, Int. J. Comput. Math. 20, No. 1, 3--21 (1986; Zbl 0655.68098) Full Text: DOI
Niemi, Valtteri The undecidability of form equivalence for context-free and EOL forms. (English) Zbl 0583.68038 Theor. Comput. Sci. 32, 261-277 (1984). MSC: 68Q45 PDFBibTeX XMLCite \textit{V. Niemi}, Theor. Comput. Sci. 32, 261--277 (1984; Zbl 0583.68038) Full Text: DOI