VERSITA Central European Science Publishers, Warsaw; http://versita.com, in cooperation with journal's owner -Maria Curie-Sklodowska University, Lublin; http://www.umcs.lublin.pl
VERSITA Central European Science Publishers, Warsaw; http://versita.com, in cooperation with journal's owner -Maria Curie-Sklodowska University, Lublin; http://www.umcs.lublin.pl