Stoeva, D. “CONNECTION BETWEEN THE LOWER P-FRAME CONDITION AND EXISTENCE OF RECONSTRUCTION FORMULAS IN A BANACH SPACE AND ITS DUAL”. Ann. Sofia Univ. Fac. Math. And Inf., vol. 97, Dec. 2005, pp. 123-3, https://stipendii.uni-sofia.bg/index.php/fmi/article/view/150.