https://humanpred.r-universe.dev/formulopshttps://humanpred.r-universe.dev/api/packages/formulopshttps://humanpred.r-universe.dev/formulops/formulops.pdfhttps://humanpred.r-universe.dev/formulops/doc/manual.htmlhttps://humanpred.r-universe.dev/formulops/NEWShttps://humanpred.r-universe.dev/formulops/NEWS.txthttps://humanpred.r-universe.dev/formulops/citationhttps://humanpred.r-universe.dev/formulops/citation.txthttps://humanpred.r-universe.dev/formulops/citation.cff