@article{krieger_moreira_2006, 
  title={Spaceborne bi- and multistatic SAR: potential and challenges}, 
  volume={153}, 
  DOI={10.1049/ip-rsn:20045111}, 
  publisher={Institution of Engineering and Technology (IET)}, 
  author={Krieger and Moreira}, 
  year={2006}
  }