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Acknowledgments This work was partly supported by the Swedish Science Council (VR) and the European Research Council (ERC). ... Concluding remarks To conclude, based on our recent work we have introduced two methods to solve the problem of spectral-line analysis for nonuniformly sampled multivariate time series. ... M = 1) and, in a related form, in  (for spatial spectral analysis, which is essentially equivalent to multivariate time series analysis with M ≥ N ) to derive a sparse parameter estimation technique ...doi:10.5281/zenodo.52301 fatcat:bl6tqrf7qzdo3hkks6kumlgxoy