Geodesic
Hadamard products and tilings
Journal of integer sequences, Tome 12 (2009) no. 7
Shapiro gave a combinatorial proof of a bilinear generating function for Chebyshev polynomials equivalent to the formula
Classification : 05A15, 05A18
Keywords: Hadamard product, Fibonacci polynomial 
@article{JIS_2009__12_7_a4,
     author = {Kim,  Jong Hyun},
     title = {Hadamard products and tilings},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {7},
     zbl = {1215.05014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_7_a4/}
}
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Kim,  Jong Hyun. Hadamard products and tilings. Journal of integer sequences, Tome 12 (2009) no. 7. http://geodesic.mathdoc.fr/item/JIS_2009__12_7_a4/