1.K.S. Arun, B. D. Rao, and S.Y. Kung, “A New Predictive Efficiency Criterion for Approximate Stochastic Realization,” IEEE Conference on Decision and Control, San Antonio, TX,  Pages: 1353-1355, 1983

2.S.Y. Kung, B. D. Rao, and K.S. Arun, “New State Space and Singular Value Decomposition Based Approximate Modeling Methods for Harmonic Analysis,” IEEE Acoustics, Speech and Signal Processing Spectrum estimation Workshop II, Tampa, FL, Pages: 266-271, Nov. 1983

3.S.Y. Kung, K.S. Arun, and B. D. Rao, “State Space and SVD Based Modeling Methods for the Harmonic Retrieval Problem,” Journal of Optical Society Of America, 73:12, Pages: 1799-1811, 1983