On the existence of a fundamental total and bounded biorthogonal sequence in every separable Banach space, and related constructions of uniformly bounded orthonormal systems in L² R. Ovsepian; A. Pełczyński — 1975 Studia Mathematica
The existence in every separable Banach space of a fundamental total and bounded biorthogonal sequence and related constructions of uniformly bounded orthonormal systems in L 2 R. I. Ovsepian; A. Pełczyński Séminaire Analyse fonctionnelle (dit "Maurey-Schwartz")