@InCollection{Karwowski:2002,
author
=
"W.Karwowski and S.Kondej",
title
=
"The Laplace operator, null set perturbations and boundary conditions",
pages
=
"233--244",
year
=
"2002",
booktitle
=
"Operator methods in ordinary and partial differential equationsKovalevsky Symposium, University of Stockholm, june 2000 ISBN: 3764367903",
publisher
=
"Birkhäuser Verlag AG",
address
=
"[B.m.]",
series
=
"Operator Theory : Advances and Applications, Vol. 132",
}