@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 Physics : the Pavel Exner Anniversary Volume, ISBN: 9783037191750",
  editor    = "eds. J. Dittrich, H. Kovařik, A. Laptev",
  publisher = "European Mathematical Society",
  address   = "Zürich",
}