Mustăţa, Costică. “On the Uniqueness of Extension and Unique Best Approximation in the Dual of an Asymmetric Normed Linear Space”. Rev. Anal. Numér. Théor. Approx. 32, no. 2 (August 1, 2003): 187–192. Accessed April 18, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2003-vol32-no2-art7.