APA (7th ed.) Citation

Sarfraz, M., Zhou, J., & Li, Y. Hyers–Ulam stability of norm-additive functional equations via ( δ , ϵ ) $(\delta , \epsilon )$ -isometries. SpringerOpen.

Chicago Style (17th ed.) Citation

Sarfraz, Muhammad, Jiang Zhou, and Yongjin Li. Hyers–Ulam Stability of Norm-additive Functional Equations via ( δ , ϵ ) $(\delta , \epsilon )$ -isometries. SpringerOpen.

MLA (9th ed.) Citation

Sarfraz, Muhammad, et al. Hyers–Ulam Stability of Norm-additive Functional Equations via ( δ , ϵ ) $(\delta , \epsilon )$ -isometries. SpringerOpen.