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\section{Related Work}  \cite{Costa_2010} describes how the Discret Fourier Transform (DFT) can be used for Information Retrieval (IR). A query is represented as a sum of individual query terms represented as sinusoidal curves. The query function is transformed in the frequency domain through DFT resulting a spectrum. Each document is considered to be a set of filters that filter the query spectrum resulting a power that ranks the documents. The more the power of the spectrum is decreased the higher the document ranks. The model is named Least Spectral Power Ranking (LSPR). The model can be used for recommender systems.  \cite{Caputo_2009}