1. Multiple tone generation by transonic compressors
2. TopolD. A. “TFaNS Tone Fan Noise Design/Prediction System. Volume I: System Description, CUP3D Technical Documentation,” NASA CR-1999-208882, 1999.
3. KochD. L. “Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center,” NASA TM-1999-209655, 1999.