1.
Hajnal P, Nagy GV. A Bijective Proof of Shapiro’s Catalan Convolution. Electron. J. Combin. [Internet]. 2014May28 [cited 2026Mar.27];21(2):P2.42. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i2p42