Morales, Alejandro H., and Ekaterina A. Vassilieva. “Direct Bijective Computation of the Generating Series for 2 and 3-Connection Coefficients of the Symmetric Group”. The Electronic Journal of Combinatorics 20, no. 2 (April 9, 2013): P6. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v20i2p6.