https://cran.r-universe.dev/spatialCovariancehttps://cran.r-universe.dev/api/packages/spatialCovariancehttps://cran.r-universe.dev/spatialCovariance/spatialCovariance.pdfhttps://cran.r-universe.dev/spatialCovariance/doc/manual.htmlhttps://cran.r-universe.dev/spatialCovariance/citationhttps://cran.r-universe.dev/spatialCovariance/citation.txthttps://cran.r-universe.dev/spatialCovariance/citation.cff