KAUSHIK, S. K.; KUMAR, Raj. On $\boldsymbol{k}$-deficit Banach Frames. Armenian Journal of Mathematics. Armenian Journal of Mathematics, Yerevan, Armenia, v. 2, n. 4, p. 146–154, 2009. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/62. Acesso em: 3 apr. 2025.