Bozdağ, Şerife Nur, and Feyza Esra Erdoğan. “On $f$-Biharmonic and Bi-$f$-Harmonic Frenet Legendre Curves”. International Journal of Maps in Mathematics, vol. 5, no. 2, Sept. 2022, pp. 112-38, https://simadp.com/journalmim/article/view/95.