https://yukai-yang.r-universe.dev/PSTRhttps://yukai-yang.r-universe.dev/api/packages/PSTRhttps://yukai-yang.r-universe.dev/PSTR/PSTR.pdfhttps://yukai-yang.r-universe.dev/PSTR/doc/manual.htmlhttps://yukai-yang.r-universe.dev/PSTR/NEWShttps://yukai-yang.r-universe.dev/PSTR/NEWS.txthttps://yukai-yang.r-universe.dev/PSTR/citationhttps://yukai-yang.r-universe.dev/PSTR/citation.txthttps://yukai-yang.r-universe.dev/PSTR/citation.cffhttps://yukai-yang.r-universe.dev/PSTR/doc/pstr-vignette.Rmdhttps://yukai-yang.r-universe.dev/articles/PSTR/pstr-vignette.html