@article{GrueningerWindtNunneretal.2002,
  author    = {Markus Gr{\"u}ninger and Marco Windt and Tamara Nunner and C. Knetter and K. P. Schmidt and G. S. Uhrig and Thilo Kopp and A. Freimuth and U. Ammerahl and B. B{\"u}chner and A. Revcolevschi},
  title     = {Optical spectroscopy of (La, Ca)(14)Cu24O41 spin ladders: comparison of experiment and theory},
  journal   = {Physica B: Condensed Matter},
  volume    = {312-313},
  pages     = {617 -- 618},
  doi       = {10.1016/S0921-4526(01)01199-1},
  year      = {2002},
}