The thesis consisted of the following three articles (plus an introduction in Polish)

• S. J. Szarek, Bases and biorthogonal systems in the spaces C and L_1, Arkiv f. Math 17 (1979), 255-271DOI
• S. Kwapien and S. Szarek, An estimation of the Lebesgue functions of biorthogonal systems with an application to the non-existence of some bases in C and L_1, Studia Math. 66 (2) (1979), 185-200 DOI
• Stanislaw J. Szarek, Nonexistence of Besselian basis in C(S), J. Funct. Anal. 37 (1) (1980), 56-67 DOI