1. G. A. Aleksandrov,Strong M-bases and equivalent norms in nonseparable Banach spaces, Godishnik na Visshite Uchebn. Zavedeniya Prilozhna Matematika19 (1983), 31–44 (Russian).
2. G. A. Aleksandrov and A. N. Plichko,The connections between strong M-bases and equivalent locally uniformly convex norms in Banach space, Compte Rendu Academie Bulgare Science40 (1987), 15–16 (Russian).
3. G. A. Aleksandrov and A. N. Plichko,Relations between strong and norming M-basis in non-separable Banach spaces, to appear.
4. S. Banach,Theorie des opérations linéaires, Monografie Mat. 1, Waszawa, 1932.
5. J. Dyer,Generalized Markushevich bases, Israel Journal Mathematics7 (1969), 51–68.