The following publications are possibly variants of this publication:
- On planar path transformationSelim G. Akl, Kamrul Islam, Henk Meijer. ipl, 104(2):59-64, 2007. [doi]
- Direct Planar Tree Transformation and CounterexampleSelim G. Akl, Kamrul Islam, Henk Meijer. cccg 2008:
- Planar tree transformation: Results and counterexampleSelim G. Akl, Kamrul Islam, Henk Meijer. ipl, 109(1):61-67, 2008. [doi]