Citations of

(with Laura L.M. Yang and L.W. Shapiro) Parity reversing involutions on plane trees and 2-Motzkin Paths, European J. Combin. 27 (2) (2006) 283–289. arXiv: math.CO/0503300.

  1. Tomislav Doslic and Darko Veljan, Secondary structures, plane trees and Motzkin numbers, Math. Commun., 12(2007), 163-169.

  2. Li Guo, Operated semigroups, Motzkin paths and rooted trees, J. Algebraic Combin., 29 (2009)(1), 35-62.

  3. Nelson Y. Li and Toufik Mansour, An identity involving Narayana numbers, European J. Combin., 29 (2008) 672–675.

  4. Stephan G. Wagner, Almost all trees have an even number of independent sets, Electron. J. Combin. 16 (2009) (1), #R93

  5. Stephan Wagner and Hua Wang, On the parity of the Wiener index, European J. Combin. 30 (2009) 996-1004.

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