Web Services Communication within the PROGRESS Grid-Portal Environment. - Piotr Grzybowski; Michal Kosiedowski; Cezary Mazurek (ICWS, 2003)

Sparse Coding in Authorship Attribution for Polish Tweets. - Piotr Grzybowski; Ewa Juralewicz; Maciej Piasecki (RANLP, 2019)