1. Preserving key in XML data transformation

   • Md. Sumon Shahriar
   • Jixue Liu

   Original Article 12 August 2009 Pages: 475 - 507

2. On the power of deep pushdown stacks

   • Argimiro Arratia Quesada
   • Iain A. Stewart

   Original Article 03 September 2009 Pages: 509 - 531

3. On regular tree languages and deterministic pushdown automata

   • Jan Janoušek
   • Bořivoj Melichar

   Original Article 01 September 2009 Pages: 533 - 547