Alexandrov, G. (1994) “On the three-spaces problem and extension of MLUR norms on Banach spaces”, Ann. Sofia Univ. Fac. Math. and Inf, 86(1), pp. 43–48. Available at: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/436 (Accessed: 21 November 2024).