SENOUSSI B, BEKKAR M. Helicoidal surfaces with Δ ᴶ ᵣ = Ar in 3-dimensional Euclidean space. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2015 Sep. 30 [cited 2025 Apr. 19];60(3):437-48. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5796