1. P. Biler, A. Witkowski, Some comments on: “A convergence test for positive series” by F. Rossatti and D. Delbosco, Math. Notae 30, 1983, 15–18;
2. A. Witkowski, Monotonicity of generalized weighted mean values, Colloq. Math. 2004 99(2) (2004), 203–206
3. A. Witkowski, Weighted extended mean values, Colloq. Math. 100(1) (2004), 111–117
4. A. Witkowski, A new proof of the monotonicity of power means, J. Inequal. Pure Appl. Math., 5(1) (2004), Article 6.
5. A. Witkowski, A new proof of the monotonicity property of power means , J. Inequal. Pure Appl. Math., 5(3) (2004), Article 73
6. A. Witkowski, On a F. Qi Integral Inequality , J. Inequal. Pure Appl. Math., 6(2) (2005), Article 36.
7. A. Witkowski, Convexity of Weighted Stolarsky Means. J. Inequal. Pure Appl. Math., 7(2) (2006), Article 73.
8. A. Witkowski, On Young's Inequality. J. Inequal. Pure Appl. Math., 7(5) (2006), Article 164.
9. A. Witkowski, On convexity of cos x^a , Octogon Math.Mag. vol.15(2007), no1, p 281
10. A. Witkowski, Comparison theorem for two-parameter means , Math. Inequal. Appl. 12(1) 2009, 11-20.
11. A. Witkowski, Monotonicity and convexity of S-means, Math. Inequal. Appl. 13(1) 2010, 33-42.
12. A. Witkowski, On Schur-convexity and Schur-geometric convexity of four-parameter family of means, Math. Inequal. Appl. 14(4) 2011, 897-903
    
13. A. Witkowski, An even easier proof of monotonicity of Stolarsky means, Kragujevac J. Math. 35(3) 2011, 447-450.
14. S. Khattri, A. Witkowski, Euler's number and some means, Tamsui Oxford Journal of Information and Mathematical Sciences, 28(4), 2012, 369-377.
    
15. Sz. Wąsowicz, A. Witkowski, On some inequality of Hermite-Hadamard type, Opuscula Math. 32/3 (2012), 591-600.
16. A. Witkowski, Interpolations of Schwab-Borchardt mean, Math. Inequal. Appl. 16(1) 2013, 193-206.
    
17. A. Witkowski, Remarks on the paper "On some new inequalities for convex functions" by M. Tunc, Turkish Journal of Mathematics (accepted)
18. A. Witkowski, Optimal harmonic interpolations between Seiffert means, Colloq. Math. 130(2) 2013, 265-279.
19. A. Witkowski, On invariance equation for means of power growth, Math. Inequal. Appl. (accepted).

Books:

1. P. Biler, A. Witkowski, Zadania z gwiazdką z analizy, zeszyt 1-9, Wydawnictwo Uniwersytetu Wrocławskiego, Wrocław 1986
2. P. Biler, A. Witkowski, Problems in mathematical analysis, Marcel Dekker, Inc. New York, 1990.

Other publications:

1. A. Witkowski, E3348, Amer. Math. Monthly, 96 (1989) p 735
2. A. Witkowski, On OQ 2279, Octogon Math.Mag. 15(2007), no.2B, p.1246
3. A. Witkowski, On OQ 2286, Octogon Math.Mag. 15(2007), no.2B, p.1246
4. A. Witkowski, On OQ 2287, Octogon Math.Mag. 15(2007), no.2B, p.1247
5. A. Witkowski, On OQ 2320, Octogon Math.Mag. 15(2007), no.2B, p.1249
6. A. Witkowski, O pewnej własności średnich potęgowych, Wiadomości Matematyczne, 45(1) 2009, 49-50
7. A. Witkowski, Guaranteeing three function values whose product is 1. College Journal of Mathematics, 43(4) 2012, p. 338-339

Conferences:

1. Conference on Inequalities and Applications '10, Hajdúszoboszló, Hungary, September 19-25, 2010. Presentation:  Gini and Stolarsky means in geometrical problems:
2. 14th International Conference on Functional Equations and Inequalities, Będlewo, September 11-17, 2011. Presentation: Interpolations of Schwab-Borchardt mean: :
3. 15th International Conference on Functional Equations and Inequalities, Ustroń, May 19-25, 2013. Presentation: Invariance equation for means of power growth: :

Materiały na kurs wyrównawczy

Część I
Część II
Część III
Część IV