- Olszowy, T. Zając, Some inequalities and superposition operator in the space of regulated functions, Adv. Nonlinear Anal. 9 (2020), 1278-1290.
- J. Banaś, T. Zając, On a measure of noncompactness in the space of regulated functions and its applications, Adv. Nonlinear Anal. 8 (2019), 1099-1110.
- Banaś, T. Zając, Well-posed minimization problems via the theory of measures of noncompactness, in Mathematical Analysis and Applications: Selected Topics, (Editors: M. Ruzhansky, H. Dutta, R.P. Agarwal), J. Wiley and Sons, 2018, 553-586, (rozdział w monografii naukowej).
- Zając, On monotonic and nonnegative solutions of nonlinear Volterra- Stieltjes integral equation, Journal of Function Spaces, vol. 2014, article ID 601824, (2014), 5 pages.
- Zając, Solvability of fractional integral equations on an unbounded interval through the theory of Volterra-Stieltjes integral equations, J. Anal. Appl. (ZAA) 33 (2014), 65-85.
- J. Banaś, T. Zając, A new approach to the theory of functional integral equations of fractional order, J. Math. Anal. Appl. 375 (2011), 375-387.
- Banaś, T. Zając, Solvability of a functional integral equation of fractional order in the class of functions having limits at infinity, Nonlinear Anal. 71 (2009), 5491-5500.
- Zając, The norms of minimal projections onto some subspaces of , J. Anal. Appl. 2 (2004), 27-38.
