Piotr (University of Warsaw Balcerowicz Poland),Agnieszka (University of Social Sciences and Humanities Kuszewska Poland)
（3）
Piotr Balcerowicz (University of Warsaw Poland),Agnieszka Kuszewska (University of Social Sciences and Humanities Poland)
（3）
Piotr Twardzisz (University of Warsaw)
（2）
;Romanowski, Piotr (University of Warsaw)
（1）
Anna (Czestochowa University Of Technology Brzozowska Poland),Piotr (War Studies University Masloch Poland),Grzegorz (SGH Warsaw School Of Economics Masloch Poland)
（1）
Kulas, Piotr (University of Warsaw, Poland),Waskiewicz, Andrzej (University of Warsaw, Poland),Krawczyk, Stanislaw (Adam Mickiewicz University, Poland)
（1）
Professor Piotr M. (University of Warsaw Majewski Poland)
（1）
；Bilski, Piotr (Warsaw University of Technology, Poland),Guerriero, Francesca (University of Calabria, Italy)
（1）
；Kulas, Piotr (University of Warsaw, Poland),Waskiewicz, Andrzej (University of Warsaw, Poland),Krawczyk, Stanislaw (Adam Mickiewicz University, Poland)
（1）
