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REFERENCES
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M. D. Atkinson, M. M. Murphy and N. Ruskuc, Sorting with two ordered stacks in series, Theoret. Comput. Sci. 289 (2002), 205-223.
R. E. Tarjan, Sorting using networks of queues and stacks, JACM, 19 (1972), 341-346.
V. Vatter, The Enumeration and Structure of Permutation Classes, Ph. D. Dissertation, Rutgers Univ., Math. Dept., 2006.
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