How to cite the Fiducial Registration Wizard package in my scientific paper

Hi,

Could anyone tell me how to cite the Fiducial Registration Wizard package in my scientific paper?
I cannot find any information related to that.

Best,
Chuan

Citing information is on the website of the extension: http://www.slicerigt.org/

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Please cite this paper if you use SlicerIGT:
Ungi T, Lasso A, Fichtinger G. Open-source platforms for navigated image-guided interventions. Med Image Anal. 2016 Oct;33:181-6. doi: 10.1016/j.media.2016.06.011.
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