@inproceedings{dziewierz_lardner_gachagan_2013, 
  title={A design methodology for 2D sparse NDE arrays using an efficient implementation of refracted-ray TFM}, 
  DOI={10.1109/ultsym.2013.0035}, 
  publisher={IEEE}, 
  author={Dziewierz and Lardner and Gachagan}, 
  year={2013}
  }