@article{CTT100631740,
  author = {H. Schwenk and D. König and S. Schmidt and M. Sieling and W. Palme and B. Lüthi and S. Zvyagin and R.S. Eccleston and M. Azuma and M. Takano},
  title = {Magnetic Resonances in Spin Ladder Systems (VO)2P2O7, SrCu2O3 and Sr2Cu3O5},
  journal = {Physica B},
  year = 1997,
}