The following publications are possibly variants of this publication:
- Language Classes Generated by Tree Controlled Grammars with Bounded Nonterminal ComplexitySherzod Turaev, Jürgen Dassow, Mohd Hasan Selamat. dcfs 2011: 289-300 [doi]
- Nonterminal Complexity of Tree Controlled Grammars Generating Context-Free LanguagesSherzod Turaev, Mohd Hasan Selamat, Mohamed Othman. jalc, 16(1):55-63, 2011.
- Nonterminal complexity of tree controlled grammarsSherzod Turaev, Jürgen Dassow, Mohd Hasan Selamat. TCS, 412(41):5789-5795, 2011. [doi]