[1] M. ALTMAN:
Contractors, approximate identities and factorization in Banach algebras. Pacific J. of Math. 48 (1973), 323-334.
MR 0390770 |
Zbl 0281.46044
[2] P. C. CURTIS, Jr. A. FIGÁ-TALAMANCA:
Factorization theorems for Banach algebras, Function algebras. ed. F. H. Birtel, Scott, Foresman & Co., Chicago 1966.
MR 0203500
[3] Vl. PTÁK:
Deux théorèmes de factorisation. C. R. Acad. Sci. Paris 278 (1974), 1091-1094.
MR 0341096
[4] Vl. PTÁK:
A theorem of the closed graph type. Manuscripts Mathematica, 13 (1974), 109-130.
MR 0348430
[5] Vl. PTÁK:
A quantitative refinement of the closed graph theorem. Czechoslovak Math. J. 99 (1974), 503-506.
MR 0348431