@article{Hańćkowiak:2009,
author
=
"J.Hańćkowiak",
title
=
"The constraint analysis of coupled equations for n-point functions",
journal
=
"Reports on Mathematical Physics",
volume
=
"Vol. 33",
number
=
"no 1-2",
pages
=
"71--75",
year
=
"1993",
}