@InCollection{Kondej:2017,
author
=
"S.Kondej",
title
=
"Spectral asymptotics induced by approaching and diverging planar circles",
pages
=
"419--432",
year
=
"2017",
booktitle
=
"Functional Analysis and Operator Theory for Quantum Physicsthe Pavel Exner Anniversary Volume ISBN: 9783037191750",
editor
=
"eds. J. Dittrich, H. Kovařik, A. Laptev",
publisher
=
"European Mathematical Society",
address
=
"Zürich",
}