@misc{Guncaga_Jan_Equations_2007,
 author={Guncaga, Jan},
 type={artykuł},
 publisher={Wydawnictwo Akademii im. Jana Długosza w Częstochowie},
 title={Equations f(x) = f-1(x) as a generator of mathematics teaching problems},
 address={Częstochowa},
 year={2007},
 language={eng},
}