@article{microstripcouplerdesignusingbatalgorithm,
  title = {Microstrip Coupler Design Using Bat Algorithm},
  author = {Ezgi Deniz Ulker and Sadik Ulker},
  year = {2014},
  eprint = {1402.0708},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1402.0708v1},
}