Labsker, L. G. “On the Weak Convergence of Sequences of Linear Functionals: (in Russian)”. Anal. Numér. Théor. Approx. 14, no. 1 (February 1, 1985): 33–57. Accessed July 20, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1985-vol14-no1-art3.