Rengarajan & Veni Madhavan (1995). Rengarajan, S.; Veni Madhavan, C. E. (1995), "Stack and queue number of 2-trees", Computing and Combinatorics: First Annual International Conference, COCOON '95 Xi'an, China, August 24–26, 1995, Proceedings, Lecture Notes in Computer Science, vol. 959, Berlin: Springer, pp. 203–212, doi:10.1007/BFb0030834, ISBN978-3-540-60216-3, MR1450116.
Rengarajan & Veni Madhavan (1995). Rengarajan, S.; Veni Madhavan, C. E. (1995), "Stack and queue number of 2-trees", Computing and Combinatorics: First Annual International Conference, COCOON '95 Xi'an, China, August 24–26, 1995, Proceedings, Lecture Notes in Computer Science, vol. 959, Berlin: Springer, pp. 203–212, doi:10.1007/BFb0030834, ISBN978-3-540-60216-3, MR1450116.