1. Heylen, W., Lammens, S., SAS, P.: Modal Analysis Theory and Testing, Leuven (1994)
2. Hermans, L., Van der Auweraer, H.: Modal testing and analysis of structures under operational conditions: industrial applications. Mech. Syst. Signal Process. 13(2), 193–216 (1999)
3. Brincker, R., Zhang, L., Andersen, P.: Modal identification from ambient responses using frequency domain decomposition. In: XVIII IMAC, S. Antonio, TX, (USA), Society for Experimental Mechanics, Inc., Bethel, CT, USA, pp. 625–630 (2000)
4. Van Overschee, P., De Moor, B.: Subspace Identification for Linear Systems, Kluver Academic Publisher (1996)
5. Agneni, A., Balis Crema, L., Coppotelli, G.: Output-only analysis of structures with closely spaced modes. Mech. Syst. Sig. Process. 24(5), 1240–1249 (2010). Special Issue: Operational Modal Analysis