@article {article, title = {Singular spectral analysis of ill-known signals and its application to predictive maintenance of windmills with SCADA records}, journal = {Soft Computing}, volume = {16}, year = {2011}, month = {05}, doi = {10.1007/s00500-011-0767-3}, author = {S{\'a}nchez, Luciano and Couso, In{\'e}s} }