1. Signature analysis, non-intrusive technique for incipient failure identification;Weichbrodt;General Electric Technical Information Series 70-C-364,1970
2. Digital Signal Processing;Oppenheimer,1975
3. On digital spectrum analysis of periodic signals;Burgess;Journal of the Acoustical Society of America,1975
4. The finite Fourier transform;Cooley;Institute of Electrical and Electronic Engineers Transactions,1969
5. Spectral Analysis;Jenkins,1968