2025. Families of Gracefuls Spiders with ℓ(2k + 1) − k, ℓ(2k + 1) − k + 1 and ℓ(2k + 1) + k + 1 Legs. Contemporary Mathematics . 6, 1 (Jan. 2025), 730–742. DOI:https://doi.org/10.37256/cm.6120255497.