Emeric Deutsch, Louis W. Shapiro. A bijection between ordered trees and 2-Motzkin paths and its many consequences. Discrete Mathematics, 256(3):655-670, 2002. [doi]
@article{DeutschS02,
title = {A bijection between ordered trees and 2-Motzkin paths and its many consequences},
author = {Emeric Deutsch and Louis W. Shapiro},
year = {2002},
doi = {10.1016/S0012-365X(02)00341-2},
url = {http://dx.doi.org/10.1016/S0012-365X(02)00341-2},
researchr = {https://researchr.org/publication/DeutschS02},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {256},
number = {3},
pages = {655-670},
}