@article{Kisielewicz:2009,
author
=
"M.Kisielewicz and K.Grytczuk",
title
=
"The existence of solutions of hereditary systems of hyperbolic type",
journal
=
"Demonstratio Mathematica",
volume
=
"T. 9",
number
=
"nr 4",
pages
=
"545--561",
year
=
"1976",
}