1.
Sapounakis A, Tsikouras P. Counting peaks and valleys in $k$-colored Motzkin paths. Electron. J. Combin. [Internet]. 2005Mar.18 [cited 2026May16];12(1):#R16. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v12i1r16