https://abarbour.r-universe.dev/psdhttps://abarbour.r-universe.dev/api/packages/psdhttps://abarbour.r-universe.dev/psd/psd.pdfhttps://abarbour.r-universe.dev/psd/doc/manual.htmlhttps://abarbour.r-universe.dev/psd/NEWShttps://abarbour.r-universe.dev/psd/NEWS.txthttps://abarbour.r-universe.dev/psd/citationhttps://abarbour.r-universe.dev/psd/citation.txthttps://abarbour.r-universe.dev/psd/citation.cffhttps://abarbour.r-universe.dev/psd/doc/psd_overview.Rnwhttps://abarbour.r-universe.dev/articles/psd/psd_overview.pdfhttps://abarbour.r-universe.dev/psd/doc/fftw.Rnwhttps://abarbour.r-universe.dev/articles/psd/fftw.pdfhttps://abarbour.r-universe.dev/psd/doc/multivariate.Rnwhttps://abarbour.r-universe.dev/articles/psd/multivariate.pdfhttps://abarbour.r-universe.dev/psd/doc/normalization.Rnwhttps://abarbour.r-universe.dev/articles/psd/normalization.pdf