Families of Graceful Spiders with 3ℓ, 3ℓ + 2 and 3ℓ – 1 Legs. Contemp. Math. [Internet]. 2024 Nov. 7 [cited 2025 Dec. 24];5(4):4908-20. Available from: https://ojs353.mebyme.cn/index.php/CM/article/view/3289