1.
Larcombe, Peter J., French, David R., Gessel, Ira M. On the Identity of von Szily: Original Derivation and a New Proof. A Canadian journal of applied mathematics, computer science and statistics [Internet]. 2003 Jun. 9 [cited 2026 Jul. 9];64. Available from: https://utilitasmathematica.com/index.php/Index/article/view/282