On variance of sample matrix eigenvalue. - Janusz L. Wywial; Grzegorz Sitek (Commun. Stat. Simul. Comput., 2021)

Book Reviews. - Grzegorz Sitek (Stud Logica, 2021)

Inferring About the Average Value of Audit Errors from Sequential Ratio Tests. - Grzegorz Sitek; Mariusz Pleszczynski (Entropy, 2024)