Citations of

William Y.C. Chen, Neil J.Y. Fan, and Jeffrey Y.T. Jia, Labeled ballot paths and the Springer numbers, SIAM J. Discrete Math. 25 (2011) 1530-1546.

  1. H.L. Chang, S.P. Eu and Y.H. Lo, Sign imbalances of snakes and valley-signed permutations, Adv. in Appl. Math. 59(2104) 26-47.

  2. M. Josuat-Vergès, Enumeration of snakes and cycle-alternating permutations, arXiv:1011.0929.

  3. S.M. Ma and Y.N. Yeh, The peak statistics on simsun permutations, Electron. J. Combin. 23(2016) #p2.14.

  4. P. Mortimer, Lattice path enumeration on restricted domains, Ph.D thesis, Queen Mary University of London.

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