@article{6214,
  author = {W. H. Urbanus and W. A. Bongers and V. Bratman and C. A. J. van der Geer and M. F. Graswinckel and P. Manintveld and B. L. Militsyn and A. Savilov},
  title = {Long-pulse operation at constant output power and single-frequency mode of a high-power electrostatic free-electron maser with depressed collector},
  year = {2002},
  journal = {Physical Review Letters},
  volume = {89},
  number = {21},
  month = {Nov},
  isbn = {0031-9007},
  url = {<Go to ISI>://000179068000024},
  language = {eng},
}