https://vkrakovna.r-universe.dev/sbfchttps://vkrakovna.r-universe.dev/api/packages/sbfchttps://vkrakovna.r-universe.dev/sbfc/sbfc.pdfhttps://vkrakovna.r-universe.dev/sbfc/doc/manual.htmlhttps://vkrakovna.r-universe.dev/sbfc/citationhttps://vkrakovna.r-universe.dev/sbfc/citation.txthttps://vkrakovna.r-universe.dev/sbfc/citation.cff