Louis W. Shapiro. A combinatorial proof of a Chevyshev polynomial identity. Discrete Mathematics, 34(2):203-206, 1981. [doi]
@article{Shapiro81:0,
title = {A combinatorial proof of a Chevyshev polynomial identity},
author = {Louis W. Shapiro},
year = {1981},
doi = {10.1016/0012-365X(81)90069-8},
url = {http://dx.doi.org/10.1016/0012-365X(81)90069-8},
researchr = {https://researchr.org/publication/Shapiro81%3A0},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {34},
number = {2},
pages = {203-206},
}